diff --git a/cereal/custom.capnp b/cereal/custom.capnp
index 58628a193b..c87ac0d2e0 100644
--- a/cereal/custom.capnp
+++ b/cereal/custom.capnp
@@ -148,6 +148,7 @@ struct LongitudinalPlanSP @0xf35cc4560bbf6ec2 {
   speedLimit @3 :SpeedLimit;
   vTarget @4 :Float32;
   aTarget @5 :Float32;
+  events @6 :List(OnroadEventSP.Event);
 
   struct DynamicExperimentalControl {
     state @0 :DynamicExperimentalControlState;
@@ -201,6 +202,7 @@ struct LongitudinalPlanSP @0xf35cc4560bbf6ec2 {
 
   struct SpeedLimit {
     resolver @0 :Resolver;
+    assist @1 :Assist;
 
     struct Resolver {
       speedLimit @0 :Float32;
@@ -214,17 +216,35 @@ struct LongitudinalPlanSP @0xf35cc4560bbf6ec2 {
       speedLimitLastValid @8 :Bool;
     }
 
+    struct Assist {
+      state @0 :AssistState;
+      enabled @1 :Bool;
+      active @2 :Bool;
+      vTarget @3 :Float32;
+      aTarget @4 :Float32;
+    }
+
     enum Source {
       none @0;
       car @1;
       map @2;
     }
+
+    enum AssistState {
+      disabled @0;
+      inactive @1; # No speed limit set or not enabled by parameter.
+      preActive @2;
+      pending @3; # Awaiting new speed limit.
+      adapting @4; # Reducing speed to match new speed limit.
+      active @5; # Cruising at speed limit.
+    }
   }
 
   enum LongitudinalPlanSource {
     cruise @0;
     sccVision @1;
     sccMap @2;
+    speedLimitAssist @3;
   }
 }
 
@@ -267,6 +287,10 @@ struct OnroadEventSP @0xda96579883444c35 {
     pedalPressedAlertOnly @16;
     laneTurnLeft @17;
     laneTurnRight @18;
+    speedLimitPreActive @19;
+    speedLimitActive @20;
+    speedLimitChanged @21;
+    speedLimitPending @22;
   }
 }
 
diff --git a/selfdrive/car/card.py b/selfdrive/car/card.py
index 2e52c00827..34f0283ce4 100755
--- a/selfdrive/car/card.py
+++ b/selfdrive/car/card.py
@@ -71,7 +71,7 @@ class Car:
 
   def __init__(self, CI=None, RI=None) -> None:
     self.can_sock = messaging.sub_sock('can', timeout=20)
-    self.sm = messaging.SubMaster(['pandaStates', 'carControl', 'onroadEvents'] + ['carControlSP'])
+    self.sm = messaging.SubMaster(['pandaStates', 'carControl', 'onroadEvents'] + ['carControlSP', 'longitudinalPlanSP'])
     self.pm = messaging.PubMaster(['sendcan', 'carState', 'carParams', 'carOutput', 'liveTracks'] + ['carParamsSP', 'carStateSP'])
 
     self.can_rcv_cum_timeout_counter = 0
@@ -216,6 +216,7 @@ class Car:
     if can_rcv_valid and REPLAY:
       self.can_log_mono_time = messaging.log_from_bytes(can_strs[0]).logMonoTime
 
+    self.v_cruise_helper.update_speed_limit_assist(self.is_metric, self.sm['longitudinalPlanSP'])
     self.v_cruise_helper.update_v_cruise(CS, self.sm['carControl'].enabled, self.is_metric)
     if self.sm['carControl'].enabled and not self.CC_prev.enabled:
       # Use CarState w/ buttons from the step selfdrived enables on
diff --git a/selfdrive/car/cruise.py b/selfdrive/car/cruise.py
index c82287d2b1..9973862b85 100644
--- a/selfdrive/car/cruise.py
+++ b/selfdrive/car/cruise.py
@@ -53,6 +53,7 @@ class VCruiseHelper(VCruiseHelperSP):
       if not self.CP.pcmCruise or (not self.CP_SP.pcmCruiseSpeed and _enabled):
         # if stock cruise is completely disabled, then we can use our own set speed logic
         self._update_v_cruise_non_pcm(CS, _enabled, is_metric)
+        self.update_speed_limit_assist_v_cruise_non_pcm()
         self.v_cruise_cluster_kph = self.v_cruise_kph
         self.update_button_timers(CS, enabled)
       else:
@@ -104,6 +105,12 @@ class VCruiseHelper(VCruiseHelperSP):
     if not self.button_change_states[button_type]["enabled"]:
       return
 
+    # Speed Limit Assist for Non PCM long cars.
+    # True: Disallow set speed changes when user confirmed the target set speed during preActive state
+    # False: Allow set speed changes as SLA is not requesting user confirmation
+    if self.update_speed_limit_assist_pre_active_confirmed(button_type):
+      return
+
     long_press, v_cruise_delta = VCruiseHelperSP.update_v_cruise_delta(self, long_press, v_cruise_delta)
     if long_press and self.v_cruise_kph % v_cruise_delta != 0:  # partial interval
       self.v_cruise_kph = CRUISE_NEAREST_FUNC[button_type](self.v_cruise_kph / v_cruise_delta) * v_cruise_delta
diff --git a/selfdrive/controls/lib/longitudinal_planner.py b/selfdrive/controls/lib/longitudinal_planner.py
index 139cdc06e7..53eca38356 100755
--- a/selfdrive/controls/lib/longitudinal_planner.py
+++ b/selfdrive/controls/lib/longitudinal_planner.py
@@ -146,7 +146,7 @@ class LongitudinalPlanner(LongitudinalPlannerSP):
       clipped_accel_coast_interp = np.interp(v_ego, [MIN_ALLOW_THROTTLE_SPEED, MIN_ALLOW_THROTTLE_SPEED*2], [accel_clip[1], clipped_accel_coast])
       accel_clip[1] = min(accel_clip[1], clipped_accel_coast_interp)
 
-    # Get new v_cruise and a_desired from Smart Cruise Control
+    # Get new v_cruise and a_desired from Smart Cruise Control and Speed Limit Assist
     v_cruise, self.a_desired = LongitudinalPlannerSP.update_targets(self, sm, self.v_desired_filter.x, self.a_desired, v_cruise)
 
     if force_slow_decel:
diff --git a/selfdrive/controls/plannerd.py b/selfdrive/controls/plannerd.py
index 8994fb7c08..4565a9c047 100755
--- a/selfdrive/controls/plannerd.py
+++ b/selfdrive/controls/plannerd.py
@@ -24,10 +24,11 @@ def main():
   pm = messaging.PubMaster(['longitudinalPlan', 'driverAssistance', 'longitudinalPlanSP'])
   sm = messaging.SubMaster(['carControl', 'carState', 'controlsState', 'liveParameters', 'radarState', 'modelV2', 'selfdriveState',
                             'liveMapDataSP', 'carStateSP', gps_location_service],
-                           poll='modelV2')
+                           poll='carState')
 
   while True:
     sm.update()
+    longitudinal_planner.sla.update_car_state(sm['carState'])
     if sm.updated['modelV2']:
       longitudinal_planner.update(sm)
       longitudinal_planner.publish(sm, pm)
diff --git a/selfdrive/selfdrived/selfdrived.py b/selfdrive/selfdrived/selfdrived.py
index 170e184629..a13c873fbe 100755
--- a/selfdrive/selfdrived/selfdrived.py
+++ b/selfdrive/selfdrived/selfdrived.py
@@ -205,6 +205,7 @@ class SelfdriveD(CruiseHelper):
 
     if not self.CP.notCar:
       self.events.add_from_msg(self.sm['driverMonitoringState'].events)
+      self.events_sp.add_from_msg(self.sm['longitudinalPlanSP'].events)
 
     # Add car events, ignore if CAN isn't valid
     if CS.canValid:
diff --git a/selfdrive/ui/qt/onroad/hud.cc b/selfdrive/ui/qt/onroad/hud.cc
index 4cfa3d0e3c..d95fe5fd80 100644
--- a/selfdrive/ui/qt/onroad/hud.cc
+++ b/selfdrive/ui/qt/onroad/hud.cc
@@ -47,10 +47,11 @@ void HudRenderer::draw(QPainter &p, const QRect &surface_rect) {
   bg.setColorAt(1, QColor::fromRgbF(0, 0, 0, 0));
   p.fillRect(0, 0, surface_rect.width(), UI_HEADER_HEIGHT, bg);
 
-
+#ifndef SUNNYPILOT
   if (is_cruise_available) {
     drawSetSpeed(p, surface_rect);
   }
+#endif
   drawCurrentSpeed(p, surface_rect);
 
   p.restore();
diff --git a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/helpers.h b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/helpers.h
index 22cdd8c631..295072d1ef 100644
--- a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/helpers.h
+++ b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/helpers.h
@@ -38,10 +38,12 @@ enum class SpeedLimitMode {
   OFF,
   INFORMATION,
   WARNING,
+  ASSIST,
 };
 
 inline const QString SpeedLimitModeTexts[]{
   QObject::tr("Off"),
   QObject::tr("Information"),
   QObject::tr("Warning"),
+  QObject::tr("Assist"),
 };
diff --git a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.cc b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.cc
index eed0306ca0..ff5d6221ce 100644
--- a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.cc
+++ b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.cc
@@ -28,6 +28,7 @@ SpeedLimitSettings::SpeedLimitSettings(QWidget *parent) : QStackedWidget(parent)
     SpeedLimitModeTexts[static_cast<int>(SpeedLimitMode::OFF)],
     SpeedLimitModeTexts[static_cast<int>(SpeedLimitMode::INFORMATION)],
     SpeedLimitModeTexts[static_cast<int>(SpeedLimitMode::WARNING)],
+    SpeedLimitModeTexts[static_cast<int>(SpeedLimitMode::ASSIST)],
   };
   speed_limit_mode_settings = new ButtonParamControlSP(
     "SpeedLimitMode",
@@ -35,7 +36,7 @@ SpeedLimitSettings::SpeedLimitSettings(QWidget *parent) : QStackedWidget(parent)
     "",
     "",
     speed_limit_mode_texts,
-    385);
+    380);
   list->addItem(speed_limit_mode_settings);
 
   list->addItem(horizontal_line());
@@ -107,6 +108,25 @@ void SpeedLimitSettings::refresh() {
   SpeedLimitOffsetType offset_type_param = static_cast<SpeedLimitOffsetType>(std::atoi(params.get("SpeedLimitOffsetType").c_str()));
   QString offsetLabel = QString::fromStdString(params.get("SpeedLimitValueOffset"));
 
+  bool has_longitudinal_control;
+  bool intelligent_cruise_button_management_available;
+  auto cp_bytes = params.get("CarParamsPersistent");
+  auto cp_sp_bytes = params.get("CarParamsSPPersistent");
+  if (!cp_bytes.empty() && !cp_sp_bytes.empty()) {
+    AlignedBuffer aligned_buf;
+    AlignedBuffer aligned_buf_sp;
+    capnp::FlatArrayMessageReader cmsg(aligned_buf.align(cp_bytes.data(), cp_bytes.size()));
+    capnp::FlatArrayMessageReader cmsg_sp(aligned_buf_sp.align(cp_sp_bytes.data(), cp_sp_bytes.size()));
+    cereal::CarParams::Reader CP = cmsg.getRoot<cereal::CarParams>();
+    cereal::CarParamsSP::Reader CP_SP = cmsg_sp.getRoot<cereal::CarParamsSP>();
+
+    has_longitudinal_control = hasLongitudinalControl(CP);
+    intelligent_cruise_button_management_available = CP_SP.getIntelligentCruiseButtonManagementAvailable();
+  } else {
+    has_longitudinal_control = false;
+    intelligent_cruise_button_management_available = false;
+  }
+
   speed_limit_mode_settings->setDescription(modeDescription(speed_limit_mode_param));
   speed_limit_offset->setDescription(offsetDescription(offset_type_param));
 
@@ -124,6 +144,13 @@ void SpeedLimitSettings::refresh() {
     speed_limit_offset->showDescription();
   }
 
+  if (has_longitudinal_control || intelligent_cruise_button_management_available) {
+    speed_limit_mode_settings->setEnableSelectedButtons(true, convertSpeedLimitModeValues(getSpeedLimitModeValues()));
+  } else {
+    speed_limit_mode_settings->setEnableSelectedButtons(true, convertSpeedLimitModeValues(
+      {SpeedLimitMode::OFF,SpeedLimitMode::INFORMATION, SpeedLimitMode::WARNING}));
+  }
+
   speed_limit_mode_settings->showDescription();
   speed_limit_offset->showDescription();
 }
diff --git a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.h b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.h
index 61c86f9208..f76f9bea2a 100644
--- a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.h
+++ b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.h
@@ -58,8 +58,11 @@ private:
     QString off_str = tr("⦿ Off: Disables the Speed Limit functions.");
     QString info_str = tr("⦿ Information: Displays the current road's speed limit.");
     QString warning_str = tr("⦿ Warning: Provides a warning when exceeding the current road's speed limit.");
+    QString assist_str = tr("⦿ Assist: Adjusts the vehicle's cruise speed based on the current road's speed limit when operating the +/- buttons.");
 
-    if (mode == SpeedLimitMode::WARNING) {
+    if (mode == SpeedLimitMode::ASSIST) {
+      assist_str = "<font color='white'><b>" + assist_str + "</b></font>";
+    } else if (mode == SpeedLimitMode::WARNING) {
       warning_str = "<font color='white'><b>" + warning_str + "</b></font>";
     } else if (mode == SpeedLimitMode::INFORMATION) {
       info_str = "<font color='white'><b>" + info_str + "</b></font>";
@@ -67,9 +70,27 @@ private:
       off_str = "<font color='white'><b>" + off_str + "</b></font>";
     }
 
-    return QString("%1<br>%2<br>%3")
+    return QString("%1<br>%2<br>%3<br>%4")
         .arg(off_str)
         .arg(info_str)
-        .arg(warning_str);
+        .arg(warning_str)
+        .arg(assist_str);
+  }
+
+  static std::vector<SpeedLimitMode> getSpeedLimitModeValues() {
+    std::vector<SpeedLimitMode> values;
+    for (int i = static_cast<int>(SpeedLimitMode::OFF);
+         i <= static_cast<int>(SpeedLimitMode::ASSIST); ++i) {
+      values.push_back(static_cast<SpeedLimitMode>(i));
+    }
+    return values;
+  }
+
+  static std::vector<int> convertSpeedLimitModeValues(const std::vector<SpeedLimitMode> &modes) {
+    std::vector<int> values;
+    for (const auto& mode : modes) {
+      values.push_back(static_cast<int>(mode));
+    }
+    return values;
   }
 };
diff --git a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal_panel.cc b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal_panel.cc
index 8987f38514..3e3977ff64 100644
--- a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal_panel.cc
+++ b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal_panel.cc
@@ -87,7 +87,6 @@ void LongitudinalPanel::showEvent(QShowEvent *event) {
 }
 
 void LongitudinalPanel::refresh(bool _offroad) {
-  auto icbm_available = false;
   auto cp_bytes = params.get("CarParamsPersistent");
   auto cp_sp_bytes = params.get("CarParamsSPPersistent");
   if (!cp_bytes.empty() && !cp_sp_bytes.empty()) {
@@ -100,12 +99,11 @@ void LongitudinalPanel::refresh(bool _offroad) {
 
     has_longitudinal_control = hasLongitudinalControl(CP);
     is_pcm_cruise = CP.getPcmCruise();
-    icbm_available = CP_SP.getIntelligentCruiseButtonManagementAvailable();
-    has_intelligent_cruise_button_management = hasIntelligentCruiseButtonManagement(CP_SP);
+    intelligent_cruise_button_management_available = CP_SP.getIntelligentCruiseButtonManagementAvailable();
   } else {
     has_longitudinal_control = false;
     is_pcm_cruise = false;
-    has_intelligent_cruise_button_management = false;
+    intelligent_cruise_button_management_available = false;
   }
 
   QString accEnabledDescription = tr("Enable custom Short & Long press increments for cruise speed increase/decrease.");
@@ -117,7 +115,7 @@ void LongitudinalPanel::refresh(bool _offroad) {
     customAccIncrement->setDescription(onroadOnlyDescription);
     customAccIncrement->showDescription();
   } else {
-    if (has_longitudinal_control || icbm_available) {
+    if (has_longitudinal_control || intelligent_cruise_button_management_available) {
       if (is_pcm_cruise) {
         customAccIncrement->setDescription(accPcmCruiseDisabledDescription);
         customAccIncrement->showDescription();
@@ -134,7 +132,7 @@ void LongitudinalPanel::refresh(bool _offroad) {
     }
   }
 
-  bool icbm_allowed = has_intelligent_cruise_button_management && !has_longitudinal_control;
+  bool icbm_allowed = intelligent_cruise_button_management_available && !has_longitudinal_control;
   intelligentCruiseButtonManagement->setEnabled(icbm_allowed && offroad);
 
   // enable toggle when long is available and is not PCM cruise
diff --git a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal_panel.h b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal_panel.h
index 2fd15e955c..0b7f39c645 100644
--- a/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal_panel.h
+++ b/selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal_panel.h
@@ -7,7 +7,6 @@
 
 #pragma once
 
-#include "selfdrive/ui/sunnypilot/qt/util.h"
 #include "selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/custom_acc_increment.h"
 #include "selfdrive/ui/sunnypilot/qt/offroad/settings/longitudinal/speed_limit/speed_limit_settings.h"
 #include "selfdrive/ui/sunnypilot/qt/offroad/settings/settings.h"
@@ -25,7 +24,7 @@ private:
   Params params;
   bool has_longitudinal_control = false;
   bool is_pcm_cruise = false;
-  bool has_intelligent_cruise_button_management = false;;
+  bool intelligent_cruise_button_management_available = false;;
   bool offroad = false;
 
   QStackedLayout *main_layout = nullptr;
diff --git a/selfdrive/ui/sunnypilot/qt/onroad/hud.cc b/selfdrive/ui/sunnypilot/qt/onroad/hud.cc
index a3e31455a5..df1bc3c002 100644
--- a/selfdrive/ui/sunnypilot/qt/onroad/hud.cc
+++ b/selfdrive/ui/sunnypilot/qt/onroad/hud.cc
@@ -11,7 +11,10 @@
 #include "selfdrive/ui/qt/util.h"
 
 
-HudRendererSP::HudRendererSP() {}
+HudRendererSP::HudRendererSP() {
+  plus_arrow_up_img = loadPixmap("../../sunnypilot/selfdrive/assets/img_plus_arrow_up", {105, 105});
+  minus_arrow_down_img = loadPixmap("../../sunnypilot/selfdrive/assets/img_minus_arrow_down", {105, 105});
+}
 
 void HudRendererSP::updateState(const UIState &s) {
   HudRenderer::updateState(s);
@@ -34,8 +37,10 @@ void HudRendererSP::updateState(const UIState &s) {
   speedLimitOffset = lp_sp.getSpeedLimit().getResolver().getSpeedLimitOffset() * speedConv;
   speedLimitValid = lp_sp.getSpeedLimit().getResolver().getSpeedLimitValid();
   speedLimitLastValid = lp_sp.getSpeedLimit().getResolver().getSpeedLimitLastValid();
-  speedLimitFinalLast = lp_sp.getSpeedLimit().getResolver().getSpeedLimitFinalLast();
+  speedLimitFinalLast = lp_sp.getSpeedLimit().getResolver().getSpeedLimitFinalLast() * speedConv;
   speedLimitMode = static_cast<SpeedLimitMode>(s.scene.speed_limit_mode);
+  speedLimitAssistState = lp_sp.getSpeedLimit().getAssist().getState();
+  speedLimitAssistActive = lp_sp.getSpeedLimit().getAssist().getActive();
   roadName = s.scene.road_name;
   if (sm.updated("liveMapDataSP")) {
     roadNameStr = QString::fromStdString(lmd.getRoadName());
@@ -104,6 +109,13 @@ void HudRendererSP::updateState(const UIState &s) {
 
 void HudRendererSP::draw(QPainter &p, const QRect &surface_rect) {
   HudRenderer::draw(p, surface_rect);
+
+  p.save();
+
+  if (is_cruise_available) {
+    drawSetSpeedSP(p, surface_rect);
+  }
+
   if (!reversing) {
     // Smart Cruise Control
     int x_offset = -260;
@@ -152,14 +164,39 @@ void HudRendererSP::draw(QPainter &p, const QRect &surface_rect) {
     }
 
     // Speed Limit
-    if (speedLimitMode != SpeedLimitMode::OFF) {
-      drawSpeedLimitSigns(p);
-      drawUpcomingSpeedLimit(p);
+    bool showSpeedLimit;
+    bool speed_limit_assist_pre_active_pulse = pulseElement(speedLimitAssistFrame);
+
+    // Position speed limit sign next to set speed box
+    const int sign_width = is_metric ? 200 : 172;
+    const int sign_x = is_metric ? 280 : 272;
+    const int sign_y = 45;
+    const int sign_height = 204;
+    QRect sign_rect(sign_x, sign_y, sign_width, sign_height);
+
+    if (speedLimitAssistState == cereal::LongitudinalPlanSP::SpeedLimit::AssistState::PRE_ACTIVE) {
+      speedLimitAssistFrame++;
+      showSpeedLimit = speed_limit_assist_pre_active_pulse;
+      drawSpeedLimitPreActiveArrow(p, sign_rect);
+    } else {
+      speedLimitAssistFrame = 0;
+      showSpeedLimit = speedLimitMode != SpeedLimitMode::OFF;
+    }
+
+    if (showSpeedLimit) {
+      drawSpeedLimitSigns(p, sign_rect);
+
+      // do not show during SLA's preActive state
+      if (speedLimitAssistState != cereal::LongitudinalPlanSP::SpeedLimit::AssistState::PRE_ACTIVE) {
+        drawUpcomingSpeedLimit(p);
+      }
     }
 
     // Road Name
     drawRoadName(p, surface_rect);
   }
+
+  p.restore();
 }
 
 void HudRendererSP::drawText(QPainter &p, int x, int y, const QString &text, QColor color) {
@@ -348,10 +385,10 @@ void HudRendererSP::drawStandstillTimer(QPainter &p, int x, int y) {
   }
 }
 
-void HudRendererSP::drawSpeedLimitSigns(QPainter &p) {
-  bool speedLimitWarningEnabled = speedLimitMode == SpeedLimitMode::WARNING;  // TODO-SP: update to include SpeedLimitMode::ASSIST
+void HudRendererSP::drawSpeedLimitSigns(QPainter &p, QRect &sign_rect) {
+  bool speedLimitWarningEnabled = speedLimitMode >= SpeedLimitMode::WARNING;  // TODO-SP: update to include SpeedLimitMode::ASSIST
   bool hasSpeedLimit = speedLimitValid || speedLimitLastValid;
-  bool overspeed = hasSpeedLimit && speedLimitFinalLast < std::nearbyint(speed);
+  bool overspeed = hasSpeedLimit && std::nearbyint(speedLimitFinalLast) < std::nearbyint(speed);
   QString speedLimitStr = hasSpeedLimit ? QString::number(std::nearbyint(speedLimitLast)) : "---";
 
   // Offset display text
@@ -365,13 +402,6 @@ void HudRendererSP::drawSpeedLimitSigns(QPainter &p) {
     speedLimitSubTextFactor = 0.475;
   }
 
-  // Position next to MAX speed box
-  const int sign_width = is_metric ? 200 : 172;
-  const int sign_x = is_metric ? 280 : 272;
-  const int sign_y = 45;
-  const int sign_height = 204;
-  QRect sign_rect(sign_x, sign_y, sign_width, sign_height);
-
   int alpha = 255;
   QColor red_color = QColor(255, 0, 0, alpha);
   QColor speed_color = (speedLimitWarningEnabled && overspeed) ? red_color :
@@ -573,3 +603,66 @@ void HudRendererSP::drawRoadName(QPainter &p, const QRect &surface_rect) {
   QString truncated = fm.elidedText(roadNameStr, Qt::ElideRight, road_rect.width() - 20);
   p.drawText(road_rect, Qt::AlignCenter, truncated);
 }
+
+void HudRendererSP::drawSpeedLimitPreActiveArrow(QPainter &p, QRect &sign_rect) {
+  const int sign_margin = 12;
+  const int arrow_spacing = sign_margin * 3;
+  int arrow_x = sign_rect.right() + arrow_spacing;
+
+  int _set_speed = std::nearbyint(set_speed);
+  int _speed_limit_final_last = std::nearbyint(speedLimitFinalLast);
+
+  // Calculate the vertical offset using a sinusoidal function for smooth bouncing
+  double bounce_frequency = 2.0 * M_PI / UI_FREQ;  // 20 frames for one full oscillation
+  int bounce_offset = 20 * sin(speedLimitAssistFrame * bounce_frequency);  // Adjust the amplitude (20 pixels) as needed
+
+  if (_set_speed < _speed_limit_final_last) {
+    QPoint iconPosition(arrow_x, sign_rect.center().y() - plus_arrow_up_img.height() / 2 + bounce_offset);
+    p.drawPixmap(iconPosition, plus_arrow_up_img);
+  } else if (_set_speed > _speed_limit_final_last) {
+    QPoint iconPosition(arrow_x, sign_rect.center().y() - minus_arrow_down_img.height() / 2 - bounce_offset);
+    p.drawPixmap(iconPosition, minus_arrow_down_img);
+  }
+}
+
+void HudRendererSP::drawSetSpeedSP(QPainter &p, const QRect &surface_rect) {
+  // Draw outer box + border to contain set speed
+  const QSize default_size = {172, 204};
+  QSize set_speed_size = is_metric ? QSize(200, 204) : default_size;
+  QRect set_speed_rect(QPoint(60 + (default_size.width() - set_speed_size.width()) / 2, 45), set_speed_size);
+
+  // Draw set speed box
+  p.setPen(QPen(QColor(255, 255, 255, 75), 6));
+  p.setBrush(QColor(0, 0, 0, 166));
+  p.drawRoundedRect(set_speed_rect, 32, 32);
+
+  // Colors based on status
+  QColor max_color = QColor(0xa6, 0xa6, 0xa6, 0xff);
+  QColor set_speed_color = QColor(0x72, 0x72, 0x72, 0xff);
+  if (is_cruise_set) {
+    set_speed_color = QColor(255, 255, 255);
+    if (speedLimitAssistActive) {
+      set_speed_color = longOverride ? QColor(0x91, 0x9b, 0x95, 0xff) : QColor(0, 0xff, 0, 0xff);
+      max_color = longOverride ? QColor(0x91, 0x9b, 0x95, 0xff) : QColor(0x80, 0xd8, 0xa6, 0xff);
+    } else {
+      if (status == STATUS_DISENGAGED) {
+        max_color = QColor(255, 255, 255);
+      } else if (status == STATUS_OVERRIDE) {
+        max_color = QColor(0x91, 0x9b, 0x95, 0xff);
+      } else {
+        max_color = QColor(0x80, 0xd8, 0xa6, 0xff);
+      }
+    }
+  }
+
+  // Draw "MAX" text
+  p.setFont(InterFont(40, QFont::DemiBold));
+  p.setPen(max_color);
+  p.drawText(set_speed_rect.adjusted(0, 27, 0, 0), Qt::AlignTop | Qt::AlignHCenter, tr("MAX"));
+
+  // Draw set speed
+  QString setSpeedStr = is_cruise_set ? QString::number(std::nearbyint(set_speed)) : "–";
+  p.setFont(InterFont(90, QFont::Bold));
+  p.setPen(set_speed_color);
+  p.drawText(set_speed_rect.adjusted(0, 77, 0, 0), Qt::AlignTop | Qt::AlignHCenter, setSpeedStr);
+}
diff --git a/selfdrive/ui/sunnypilot/qt/onroad/hud.h b/selfdrive/ui/sunnypilot/qt/onroad/hud.h
index d77892fa2d..043536bf4c 100644
--- a/selfdrive/ui/sunnypilot/qt/onroad/hud.h
+++ b/selfdrive/ui/sunnypilot/qt/onroad/hud.h
@@ -31,9 +31,11 @@ private:
   void drawStandstillTimer(QPainter &p, int x, int y);
   bool pulseElement(int frame);
   void drawSmartCruiseControlOnroadIcon(QPainter &p, const QRect &surface_rect, int x_offset, int y_offset, std::string name);
-  void drawSpeedLimitSigns(QPainter &p);
+  void drawSpeedLimitSigns(QPainter &p, QRect &sign_rect);
   void drawUpcomingSpeedLimit(QPainter &p);
   void drawRoadName(QPainter &p, const QRect &surface_rect);
+  void drawSpeedLimitPreActiveArrow(QPainter &p, QRect &sign_rect);
+  void drawSetSpeedSP(QPainter &p, const QRect &surface_rect);
 
   bool lead_status;
   float lead_d_rel;
@@ -86,4 +88,9 @@ private:
   SpeedLimitMode speedLimitMode = SpeedLimitMode::OFF;
   bool roadName;
   QString roadNameStr;
+  cereal::LongitudinalPlanSP::SpeedLimit::AssistState speedLimitAssistState;
+  bool speedLimitAssistActive;
+  int speedLimitAssistFrame;
+  QPixmap plus_arrow_up_img;
+  QPixmap minus_arrow_down_img;
 };
diff --git a/selfdrive/ui/sunnypilot/qt/util.cc b/selfdrive/ui/sunnypilot/qt/util.cc
index eaf05942a9..2e066e88b5 100644
--- a/selfdrive/ui/sunnypilot/qt/util.cc
+++ b/selfdrive/ui/sunnypilot/qt/util.cc
@@ -123,7 +123,3 @@ std::optional<cereal::Event::Reader> loadCerealEvent(Params& params, const std::
     return std::nullopt;
   }
 }
-
-bool hasIntelligentCruiseButtonManagement(const cereal::CarParamsSP::Reader &car_params_sp) {
-  return car_params_sp.getIntelligentCruiseButtonManagementAvailable() && Params().getBool("IntelligentCruiseButtonManagement");
-}
diff --git a/selfdrive/ui/sunnypilot/qt/util.h b/selfdrive/ui/sunnypilot/qt/util.h
index 60a73615ba..4b9d615ce5 100644
--- a/selfdrive/ui/sunnypilot/qt/util.h
+++ b/selfdrive/ui/sunnypilot/qt/util.h
@@ -23,4 +23,3 @@ std::optional<QString> getParamIgnoringDefault(const std::string &param_name, co
 QMap<QString, QVariantMap> loadPlatformList();
 QStringList searchFromList(const QString &query, const QStringList &list);
 std::optional<cereal::Event::Reader> loadCerealEvent(Params& params, const std::string& _param);
-bool hasIntelligentCruiseButtonManagement(const cereal::CarParamsSP::Reader &car_params_sp);
diff --git a/sunnypilot/mads/mads.py b/sunnypilot/mads/mads.py
index f16b688358..b75bd8ccda 100644
--- a/sunnypilot/mads/mads.py
+++ b/sunnypilot/mads/mads.py
@@ -102,12 +102,13 @@ class ModularAssistiveDrivingSystem:
 
   def update_events(self, CS: structs.CarState):
     if not self.selfdrive.enabled and self.enabled:
-      if self.events.has(EventName.doorOpen):
-        self.replace_event(EventName.doorOpen, EventNameSP.silentDoorOpen)
-        self.transition_paused_state()
-      if self.events.has(EventName.seatbeltNotLatched):
-        self.replace_event(EventName.seatbeltNotLatched, EventNameSP.silentSeatbeltNotLatched)
-        self.transition_paused_state()
+      if CS.standstill:
+        if self.events.has(EventName.doorOpen):
+          self.replace_event(EventName.doorOpen, EventNameSP.silentDoorOpen)
+          self.transition_paused_state()
+        if self.events.has(EventName.seatbeltNotLatched):
+          self.replace_event(EventName.seatbeltNotLatched, EventNameSP.silentSeatbeltNotLatched)
+          self.transition_paused_state()
       if self.events.has(EventName.wrongGear) and (CS.vEgo < 2.5 or CS.gearShifter == GearShifter.reverse):
         self.replace_event(EventName.wrongGear, EventNameSP.silentWrongGear)
         self.transition_paused_state()
diff --git a/sunnypilot/selfdrive/assets/img_minus_arrow_down.png b/sunnypilot/selfdrive/assets/img_minus_arrow_down.png
new file mode 100644
index 0000000000..250f640585
--- /dev/null
+++ b/sunnypilot/selfdrive/assets/img_minus_arrow_down.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:0f4a0bf26cfd2c64939759d43bee839aadfd017a6f74065095a27b03615e55a4
+size 26627
diff --git a/sunnypilot/selfdrive/assets/img_plus_arrow_up.png b/sunnypilot/selfdrive/assets/img_plus_arrow_up.png
new file mode 100644
index 0000000000..14c1529da3
--- /dev/null
+++ b/sunnypilot/selfdrive/assets/img_plus_arrow_up.png
@@ -0,0 +1,3 @@
+version https://git-lfs.github.com/spec/v1
+oid sha256:3e451ff31e9b3f144822ab282b8e47cd5a603ca59ff94bd1849271181b86c6b1
+size 29220
diff --git a/sunnypilot/selfdrive/car/cruise_ext.py b/sunnypilot/selfdrive/car/cruise_ext.py
index 716e3e1c93..3691c35972 100644
--- a/sunnypilot/selfdrive/car/cruise_ext.py
+++ b/sunnypilot/selfdrive/car/cruise_ext.py
@@ -6,18 +6,24 @@ See the LICENSE.md file in the root directory for more details.
 """
 import numpy as np
 
-from cereal import car
+from cereal import car, custom
 from opendbc.car import structs
+from openpilot.common.constants import CV
 from openpilot.common.params import Params
 from openpilot.sunnypilot.selfdrive.car.intelligent_cruise_button_management.helpers import get_minimum_set_speed
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.speed_limit_assist import ACTIVE_STATES as SLA_ACTIVE_STATES
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.helpers import compare_cluster_target
 
 ButtonType = car.CarState.ButtonEvent.Type
+SpeedLimitAssistState = custom.LongitudinalPlanSP.SpeedLimit.AssistState
 
 CRUISE_BUTTON_TIMER = {ButtonType.decelCruise: 0, ButtonType.accelCruise: 0,
                        ButtonType.setCruise: 0, ButtonType.resumeCruise: 0,
                        ButtonType.cancel: 0, ButtonType.mainCruise: 0}
 
 V_CRUISE_MIN = 8
+V_CRUISE_MAX = 145
+V_CRUISE_UNSET = 255
 
 
 def update_manual_button_timers(CS: car.CarState, button_timers: dict[car.CarState.ButtonEvent.Type, int]) -> None:
@@ -32,11 +38,12 @@ def update_manual_button_timers(CS: car.CarState, button_timers: dict[car.CarSta
       button_timers[b.type.raw] = 1 if b.pressed else 0
 
 
-
 class VCruiseHelperSP:
   def __init__(self, CP: structs.CarParams, CP_SP: structs.CarParamsSP) -> None:
     self.CP = CP
     self.CP_SP = CP_SP
+    self.v_cruise_kph = V_CRUISE_UNSET
+    self.v_cruise_cluster_kph = V_CRUISE_UNSET
     self.params = Params()
     self.v_cruise_min = 0
     self.enabled_prev = False
@@ -47,6 +54,16 @@ class VCruiseHelperSP:
 
     self.enable_button_timers = CRUISE_BUTTON_TIMER
 
+    # Speed Limit Assist
+    self.sla_state = SpeedLimitAssistState.disabled
+    self.prev_sla_state = SpeedLimitAssistState.disabled
+    self.has_speed_limit = False
+    self.speed_limit_final_last = 0.
+    self.speed_limit_final_last_kph = 0.
+    self.prev_speed_limit_final_last_kph = 0.
+    self.req_plus = False
+    self.req_minus = False
+
   def read_custom_set_speed_params(self) -> None:
     self.custom_acc_enabled = self.params.get_bool("CustomAccIncrementsEnabled")
     self.short_increment = self.params.get("CustomAccShortPressIncrement", return_default=True)
@@ -89,3 +106,33 @@ class VCruiseHelperSP:
       return enabled and self.enabled_prev
 
     return enabled
+
+  def update_speed_limit_assist(self, is_metric, LP_SP: custom.LongitudinalPlanSP) -> None:
+    resolver = LP_SP.speedLimit.resolver
+    self.has_speed_limit = resolver.speedLimitValid or resolver.speedLimitLastValid
+    self.speed_limit_final_last = LP_SP.speedLimit.resolver.speedLimitFinalLast
+    self.speed_limit_final_last_kph = self.speed_limit_final_last * CV.MS_TO_KPH
+    self.sla_state = LP_SP.speedLimit.assist.state
+    self.req_plus, self.req_minus = compare_cluster_target(self.v_cruise_cluster_kph * CV.KPH_TO_MS,
+                                                           self.speed_limit_final_last, is_metric)
+
+  @property
+  def update_speed_limit_final_last_changed(self) -> bool:
+    return self.has_speed_limit and bool(self.speed_limit_final_last_kph != self.prev_speed_limit_final_last_kph)
+
+  def update_speed_limit_assist_pre_active_confirmed(self, button_type: car.CarState.ButtonEvent.Type) -> bool:
+    if self.sla_state == SpeedLimitAssistState.preActive or self.prev_sla_state == SpeedLimitAssistState.preActive:
+      if button_type == ButtonType.decelCruise and self.req_minus:
+        return True
+      if button_type == ButtonType.accelCruise and self.req_plus:
+        return True
+
+    return False
+
+  def update_speed_limit_assist_v_cruise_non_pcm(self) -> None:
+    if self.sla_state in SLA_ACTIVE_STATES and (self.prev_sla_state not in SLA_ACTIVE_STATES or
+                                                self.update_speed_limit_final_last_changed):
+      self.v_cruise_kph = np.clip(round(self.speed_limit_final_last_kph, 1), self.v_cruise_min, V_CRUISE_MAX)
+
+    self.prev_sla_state = self.sla_state
+    self.prev_speed_limit_final_last_kph = self.speed_limit_final_last_kph
diff --git a/sunnypilot/selfdrive/controls/lib/longitudinal_planner.py b/sunnypilot/selfdrive/controls/lib/longitudinal_planner.py
index 40d30100c5..ece2ff2419 100644
--- a/sunnypilot/selfdrive/controls/lib/longitudinal_planner.py
+++ b/sunnypilot/selfdrive/controls/lib/longitudinal_planner.py
@@ -7,22 +7,29 @@ See the LICENSE.md file in the root directory for more details.
 
 from cereal import messaging, custom
 from opendbc.car import structs
+from openpilot.common.constants import CV
+from openpilot.selfdrive.car.cruise import V_CRUISE_MAX
 from openpilot.sunnypilot.selfdrive.controls.lib.dec.dec import DynamicExperimentalController
 from openpilot.sunnypilot.selfdrive.controls.lib.smart_cruise_control.smart_cruise_control import SmartCruiseControl
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.speed_limit_assist import SpeedLimitAssist
 from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.speed_limit_resolver import SpeedLimitResolver
+from openpilot.sunnypilot.selfdrive.selfdrived.events import EventsSP
 from openpilot.sunnypilot.models.helpers import get_active_bundle
 
 DecState = custom.LongitudinalPlanSP.DynamicExperimentalControl.DynamicExperimentalControlState
-Source = custom.LongitudinalPlanSP.LongitudinalPlanSource
+LongitudinalPlanSource = custom.LongitudinalPlanSP.LongitudinalPlanSource
 
 
 class LongitudinalPlannerSP:
   def __init__(self, CP: structs.CarParams, mpc):
+    self.events_sp = EventsSP()
+    self.resolver = SpeedLimitResolver()
     self.dec = DynamicExperimentalController(CP, mpc)
     self.scc = SmartCruiseControl()
     self.resolver = SpeedLimitResolver()
+    self.sla = SpeedLimitAssist(CP)
     self.generation = int(model_bundle.generation) if (model_bundle := get_active_bundle()) else None
-    self.source = Source.cruise
+    self.source = LongitudinalPlanSource.cruise
 
     self.output_v_target = 0.
     self.output_a_target = 0.
@@ -39,15 +46,31 @@ class LongitudinalPlannerSP:
     return self.dec.mode()
 
   def update_targets(self, sm: messaging.SubMaster, v_ego: float, a_ego: float, v_cruise: float) -> tuple[float, float]:
-    self.scc.update(sm, v_ego, a_ego, v_cruise)
+    CS = sm['carState']
+    v_cruise_cluster_kph = min(CS.vCruiseCluster, V_CRUISE_MAX)
+    v_cruise_cluster = v_cruise_cluster_kph * CV.KPH_TO_MS
+
+    long_enabled = sm['carControl'].enabled
+    long_override = sm['carControl'].cruiseControl.override
+
+    self.events_sp.clear()
+
+    # Smart Cruise Control
+    self.scc.update(sm, long_enabled, long_override, v_ego, a_ego, v_cruise)
 
     # Speed Limit Resolver
     self.resolver.update(v_ego, sm)
 
+    # Speed Limit Assist
+    has_speed_limit = self.resolver.speed_limit_valid or self.resolver.speed_limit_last_valid
+    self.sla.update(long_enabled, long_override, v_ego, a_ego, v_cruise_cluster, self.resolver.speed_limit,
+                    self.resolver.speed_limit_final_last, has_speed_limit, self.resolver.distance, self.events_sp)
+
     targets = {
-      Source.cruise: (v_cruise, a_ego),
-      Source.sccVision: (self.scc.vision.output_v_target, self.scc.vision.output_a_target),
-      Source.sccMap: (self.scc.map.output_v_target, self.scc.map.output_a_target),
+      LongitudinalPlanSource.cruise: (v_cruise, a_ego),
+      LongitudinalPlanSource.sccVision: (self.scc.vision.output_v_target, self.scc.vision.output_a_target),
+      LongitudinalPlanSource.sccMap: (self.scc.map.output_v_target, self.scc.map.output_a_target),
+      LongitudinalPlanSource.speedLimitAssist: (self.sla.output_v_target, self.sla.output_a_target),
     }
 
     self.source = min(targets, key=lambda k: targets[k][0])
@@ -66,6 +89,7 @@ class LongitudinalPlannerSP:
     longitudinalPlanSP.longitudinalPlanSource = self.source
     longitudinalPlanSP.vTarget = float(self.output_v_target)
     longitudinalPlanSP.aTarget = float(self.output_a_target)
+    longitudinalPlanSP.events = self.events_sp.to_msg()
 
     # Dynamic Experimental Control
     dec = longitudinalPlanSP.dec
@@ -104,5 +128,11 @@ class LongitudinalPlannerSP:
     resolver.speedLimitOffset = float(self.resolver.speed_limit_offset)
     resolver.distToSpeedLimit = float(self.resolver.distance)
     resolver.source = self.resolver.source
+    assist = speedLimit.assist
+    assist.state = self.sla.state
+    assist.enabled = self.sla.is_enabled
+    assist.active = self.sla.is_active
+    assist.vTarget = float(self.sla.output_v_target)
+    assist.aTarget = float(self.sla.output_a_target)
 
     pm.send('longitudinalPlanSP', plan_sp_send)
diff --git a/sunnypilot/selfdrive/controls/lib/smart_cruise_control/smart_cruise_control.py b/sunnypilot/selfdrive/controls/lib/smart_cruise_control/smart_cruise_control.py
index 0f60621658..4ca45202fc 100644
--- a/sunnypilot/selfdrive/controls/lib/smart_cruise_control/smart_cruise_control.py
+++ b/sunnypilot/selfdrive/controls/lib/smart_cruise_control/smart_cruise_control.py
@@ -14,9 +14,6 @@ class SmartCruiseControl:
     self.vision = SmartCruiseControlVision()
     self.map = SmartCruiseControlMap()
 
-  def update(self, sm: messaging.SubMaster, v_ego: float, a_ego: float, v_cruise: float) -> None:
-    long_enabled = sm['carControl'].enabled
-    long_override = sm['carControl'].cruiseControl.override
-
+  def update(self, sm: messaging.SubMaster, long_enabled: bool, long_override: bool, v_ego: float, a_ego: float, v_cruise: float) -> None:
     self.map.update(long_enabled, long_override, v_ego, a_ego, v_cruise)
     self.vision.update(sm, long_enabled, long_override, v_ego, a_ego, v_cruise)
diff --git a/sunnypilot/selfdrive/controls/lib/speed_limit/__init__.py b/sunnypilot/selfdrive/controls/lib/speed_limit/__init__.py
index af14a87f0c..22ea75fe19 100644
--- a/sunnypilot/selfdrive/controls/lib/speed_limit/__init__.py
+++ b/sunnypilot/selfdrive/controls/lib/speed_limit/__init__.py
@@ -6,3 +6,14 @@ See the LICENSE.md file in the root directory for more details.
 """
 LIMIT_ADAPT_ACC = -1.  # m/s^2 Ideal acceleration for the adapting (braking) phase when approaching speed limits.
 LIMIT_MAX_MAP_DATA_AGE = 10.  # s Maximum time to hold to map data, then consider it invalid inside limits controllers.
+
+# Speed Limit Assist constants
+PCM_LONG_REQUIRED_MAX_SET_SPEED = {
+  True: (33.3333, 36.1111),  # km/h, (120, 130)
+  False: (31.2928, 35.7632),  # mph, (70, 80)
+}
+
+CONFIRM_SPEED_THRESHOLD = {
+  True: 80,   # km/h
+  False: 50,  # mph
+}
diff --git a/sunnypilot/selfdrive/controls/lib/speed_limit/common.py b/sunnypilot/selfdrive/controls/lib/speed_limit/common.py
index 7d219ac3bb..baf9328032 100644
--- a/sunnypilot/selfdrive/controls/lib/speed_limit/common.py
+++ b/sunnypilot/selfdrive/controls/lib/speed_limit/common.py
@@ -19,3 +19,10 @@ class OffsetType(IntEnum):
   off = 0
   fixed = 1
   percentage = 2
+
+
+class Mode(IntEnum):
+  off = 0
+  information = 1
+  warning = 2
+  assist = 3
diff --git a/sunnypilot/selfdrive/controls/lib/speed_limit/helpers.py b/sunnypilot/selfdrive/controls/lib/speed_limit/helpers.py
new file mode 100644
index 0000000000..40e8f653ff
--- /dev/null
+++ b/sunnypilot/selfdrive/controls/lib/speed_limit/helpers.py
@@ -0,0 +1,19 @@
+"""
+Copyright (c) 2021-, Haibin Wen, sunnypilot, and a number of other contributors.
+
+This file is part of sunnypilot and is licensed under the MIT License.
+See the LICENSE.md file in the root directory for more details.
+"""
+
+from openpilot.common.constants import CV
+
+
+def compare_cluster_target(v_cruise_cluster: float, target_set_speed: float, is_metric: bool) -> tuple[bool, bool]:
+  speed_conv = CV.MS_TO_KPH if is_metric else CV.MS_TO_MPH
+  v_cruise_cluster_conv = round(v_cruise_cluster * speed_conv)
+  target_set_speed_conv = round(target_set_speed * speed_conv)
+
+  req_plus = v_cruise_cluster_conv < target_set_speed_conv
+  req_minus = v_cruise_cluster_conv > target_set_speed_conv
+
+  return req_plus, req_minus
diff --git a/sunnypilot/selfdrive/controls/lib/speed_limit/speed_limit_assist.py b/sunnypilot/selfdrive/controls/lib/speed_limit/speed_limit_assist.py
new file mode 100644
index 0000000000..bb03a9eb1c
--- /dev/null
+++ b/sunnypilot/selfdrive/controls/lib/speed_limit/speed_limit_assist.py
@@ -0,0 +1,401 @@
+"""
+Copyright (c) 2021-, Haibin Wen, sunnypilot, and a number of other contributors.
+
+This file is part of sunnypilot and is licensed under the MIT License.
+See the LICENSE.md file in the root directory for more details.
+"""
+import time
+
+from cereal import custom, car
+from openpilot.common.params import Params
+from openpilot.common.constants import CV
+from openpilot.common.realtime import DT_MDL
+from openpilot.sunnypilot import PARAMS_UPDATE_PERIOD
+from openpilot.selfdrive.controls.lib.drive_helpers import CONTROL_N
+from openpilot.sunnypilot.selfdrive.selfdrived.events import EventsSP
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit import PCM_LONG_REQUIRED_MAX_SET_SPEED, CONFIRM_SPEED_THRESHOLD
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.common import Mode
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.helpers import compare_cluster_target
+from openpilot.selfdrive.modeld.constants import ModelConstants
+
+ButtonType = car.CarState.ButtonEvent.Type
+EventNameSP = custom.OnroadEventSP.EventName
+SpeedLimitAssistState = custom.LongitudinalPlanSP.SpeedLimit.AssistState
+SpeedLimitSource = custom.LongitudinalPlanSP.SpeedLimit.Source
+
+ACTIVE_STATES = (SpeedLimitAssistState.active, SpeedLimitAssistState.adapting)
+ENABLED_STATES = (SpeedLimitAssistState.preActive, SpeedLimitAssistState.pending, *ACTIVE_STATES)
+
+DISABLED_GUARD_PERIOD = 0.5  # secs.
+PRE_ACTIVE_GUARD_PERIOD = 15  # secs. Time to wait after activation before considering temp deactivation signal.
+SPEED_LIMIT_CHANGED_HOLD_PERIOD = 1  # secs. Time to wait after speed limit change before switching to preActive.
+
+LIMIT_MIN_ACC = -1.5  # m/s^2 Maximum deceleration allowed for limit controllers to provide.
+LIMIT_MAX_ACC = 1.0   # m/s^2 Maximum acceleration allowed for limit controllers to provide while active.
+LIMIT_MIN_SPEED = 8.33  # m/s, Minimum speed limit to provide as solution on limit controllers.
+LIMIT_SPEED_OFFSET_TH = -1.  # m/s Maximum offset between speed limit and current speed for adapting state.
+V_CRUISE_UNSET = 255
+
+CRUISE_BUTTONS_PLUS = (ButtonType.accelCruise, ButtonType.resumeCruise)
+CRUISE_BUTTONS_MINUS = (ButtonType.decelCruise, ButtonType.setCruise)
+CRUISE_BUTTON_CONFIRM_HOLD = 0.5  # secs.
+
+
+class SpeedLimitAssist:
+  _speed_limit_final_last: float
+  _distance: float
+  v_ego: float
+  a_ego: float
+  v_offset: float
+
+  def __init__(self, CP):
+    self.params = Params()
+    self.CP = CP
+    self.frame = -1
+    self.long_engaged_timer = 0
+    self.pre_active_timer = 0
+    self.speed_limit_changed_timer = 0
+    self.is_metric = self.params.get_bool("IsMetric")
+    self.enabled = self.params.get("SpeedLimitMode", return_default=True) == Mode.assist
+    self.long_enabled = False
+    self.long_enabled_prev = False
+    self.is_enabled = False
+    self.is_active = False
+    self.output_v_target = V_CRUISE_UNSET
+    self.output_a_target = 0.
+    self.v_ego = 0.
+    self.a_ego = 0.
+    self.v_offset = 0.
+    self.target_set_speed_conv = 0
+    self.prev_target_set_speed_conv = 0
+    self.v_cruise_cluster = 0.
+    self.v_cruise_cluster_prev = 0.
+    self.v_cruise_cluster_conv = 0
+    self.prev_v_cruise_cluster_conv = 0
+    self._has_speed_limit = False
+    self._speed_limit = 0.
+    self._speed_limit_final_last = 0.
+    self.speed_limit_prev = 0.
+    self.speed_limit_final_last_conv = 0
+    self.prev_speed_limit_final_last_conv = 0
+    self._distance = 0.
+    self.state = SpeedLimitAssistState.disabled
+    self._state_prev = SpeedLimitAssistState.disabled
+    self.pcm_op_long = CP.openpilotLongitudinalControl and CP.pcmCruise
+
+    self._plus_hold = 0.
+    self._minus_hold = 0.
+    self._last_carstate_ts = 0.
+
+    # TODO-SP: SLA's own output_a_target for planner
+    # Solution functions mapped to respective states
+    self.acceleration_solutions = {
+      SpeedLimitAssistState.disabled: self.get_current_acceleration_as_target,
+      SpeedLimitAssistState.inactive: self.get_current_acceleration_as_target,
+      SpeedLimitAssistState.preActive: self.get_current_acceleration_as_target,
+      SpeedLimitAssistState.pending: self.get_current_acceleration_as_target,
+      SpeedLimitAssistState.adapting: self.get_adapting_state_target_acceleration,
+      SpeedLimitAssistState.active: self.get_active_state_target_acceleration,
+    }
+
+  @property
+  def speed_limit_changed(self) -> bool:
+    return self._has_speed_limit and bool(self._speed_limit != self.speed_limit_prev)
+
+  @property
+  def v_cruise_cluster_changed(self) -> bool:
+    return bool(self.v_cruise_cluster_conv != self.prev_v_cruise_cluster_conv)
+
+  @property
+  def target_set_speed_confirmed(self) -> bool:
+    return bool(self.v_cruise_cluster_conv == self.target_set_speed_conv)
+
+  def get_v_target_from_control(self) -> float:
+    if self._has_speed_limit:
+      if self.pcm_op_long and self.is_enabled:
+        return self._speed_limit_final_last
+      if not self.pcm_op_long and self.is_active:
+        return self._speed_limit_final_last
+
+    # Fallback
+    return V_CRUISE_UNSET
+
+  # TODO-SP: SLA's own output_a_target for planner
+  def get_a_target_from_control(self) -> float:
+    return self.a_ego
+
+  def update_params(self) -> None:
+    if self.frame % int(PARAMS_UPDATE_PERIOD / DT_MDL) == 0:
+      self.is_metric = self.params.get_bool("IsMetric")
+      self.enabled = self.params.get("SpeedLimitMode", return_default=True) == Mode.assist
+
+  def update_car_state(self, CS: car.CarState) -> None:
+    now = time.monotonic()
+    self._last_carstate_ts = now
+
+    for b in CS.buttonEvents:
+      if not b.pressed:
+        if b.type in CRUISE_BUTTONS_PLUS:
+          self._plus_hold = max(self._plus_hold, now + CRUISE_BUTTON_CONFIRM_HOLD)
+        elif b.type in CRUISE_BUTTONS_MINUS:
+          self._minus_hold = max(self._minus_hold, now + CRUISE_BUTTON_CONFIRM_HOLD)
+
+  def _get_button_release(self, req_plus: bool, req_minus: bool) -> bool:
+    now = time.monotonic()
+    if req_plus and now <= self._plus_hold:
+      self._plus_hold = 0.
+      return True
+    elif req_minus and now <= self._minus_hold:
+      self._minus_hold = 0.
+      return True
+
+    # expired
+    if now > self._plus_hold:
+      self._plus_hold = 0.
+    if now > self._minus_hold:
+      self._minus_hold = 0.
+    return False
+
+  def update_calculations(self, v_cruise_cluster: float) -> None:
+    speed_conv = CV.MS_TO_KPH if self.is_metric else CV.MS_TO_MPH
+    self.v_cruise_cluster = v_cruise_cluster
+
+    # Update current velocity offset (error)
+    self.v_offset = self._speed_limit_final_last - self.v_ego
+
+    self.speed_limit_final_last_conv = round(self._speed_limit_final_last * speed_conv)
+    self.v_cruise_cluster_conv = round(self.v_cruise_cluster * speed_conv)
+
+    cst_low, cst_high = PCM_LONG_REQUIRED_MAX_SET_SPEED[self.is_metric]
+    pcm_long_required_max = cst_low if self._has_speed_limit and self.speed_limit_final_last_conv < CONFIRM_SPEED_THRESHOLD[self.is_metric] else \
+                            cst_high
+    pcm_long_required_max_set_speed_conv = round(pcm_long_required_max * speed_conv)
+
+    self.target_set_speed_conv = pcm_long_required_max_set_speed_conv if self.pcm_op_long else self.speed_limit_final_last_conv
+
+  @property
+  def apply_confirm_speed_threshold(self) -> bool:
+    # below CST: always require user confirmation
+    if self.v_cruise_cluster_conv < CONFIRM_SPEED_THRESHOLD[self.is_metric]:
+      return True
+
+    # at/above CST:
+    # - new speed limit >= CST: auto change
+    # - new speed limit < CST: user confirmation required
+    return bool(self.speed_limit_final_last_conv < CONFIRM_SPEED_THRESHOLD[self.is_metric])
+
+  def get_current_acceleration_as_target(self) -> float:
+    return self.a_ego
+
+  def get_adapting_state_target_acceleration(self) -> float:
+    if self._distance > 0:
+      return (self._speed_limit_final_last ** 2 - self.v_ego ** 2) / (2. * self._distance)
+
+    return self.v_offset / float(ModelConstants.T_IDXS[CONTROL_N])
+
+  def get_active_state_target_acceleration(self) -> float:
+    return self.v_offset / float(ModelConstants.T_IDXS[CONTROL_N])
+
+  def _update_confirmed_state(self):
+    if self._has_speed_limit:
+      if self.v_offset < LIMIT_SPEED_OFFSET_TH:
+        self.state = SpeedLimitAssistState.adapting
+      else:
+        self.state = SpeedLimitAssistState.active
+    else:
+      self.state = SpeedLimitAssistState.pending
+
+  def _update_non_pcm_long_confirmed_state(self) -> bool:
+    if self.target_set_speed_confirmed:
+      return True
+
+    if self.state != SpeedLimitAssistState.preActive:
+      return False
+
+    req_plus, req_minus = compare_cluster_target(self.v_cruise_cluster, self._speed_limit_final_last, self.is_metric)
+
+    return self._get_button_release(req_plus, req_minus)
+
+  def update_state_machine_pcm_op_long(self):
+    self.long_engaged_timer = max(0, self.long_engaged_timer - 1)
+    self.pre_active_timer = max(0, self.pre_active_timer - 1)
+
+    # ACTIVE, ADAPTING, PENDING, PRE_ACTIVE, INACTIVE
+    if self.state != SpeedLimitAssistState.disabled:
+      if not self.long_enabled or not self.enabled:
+        self.state = SpeedLimitAssistState.disabled
+
+      else:
+        # ACTIVE
+        if self.state == SpeedLimitAssistState.active:
+          if self.v_cruise_cluster_changed:
+            self.state = SpeedLimitAssistState.inactive
+          elif self.speed_limit_changed and self.apply_confirm_speed_threshold:
+            self.state = SpeedLimitAssistState.preActive
+            self.pre_active_timer = int(PRE_ACTIVE_GUARD_PERIOD / DT_MDL)
+          elif self._has_speed_limit and self.v_offset < LIMIT_SPEED_OFFSET_TH:
+            self.state = SpeedLimitAssistState.adapting
+
+        # ADAPTING
+        elif self.state == SpeedLimitAssistState.adapting:
+          if self.v_cruise_cluster_changed:
+            self.state = SpeedLimitAssistState.inactive
+          elif self.speed_limit_changed and self.apply_confirm_speed_threshold:
+            self.state = SpeedLimitAssistState.preActive
+            self.pre_active_timer = int(PRE_ACTIVE_GUARD_PERIOD / DT_MDL)
+          elif self.v_offset >= LIMIT_SPEED_OFFSET_TH:
+            self.state = SpeedLimitAssistState.active
+
+        # PENDING
+        elif self.state == SpeedLimitAssistState.pending:
+          if self._has_speed_limit:
+            if self.v_offset < LIMIT_SPEED_OFFSET_TH:
+              self.state = SpeedLimitAssistState.adapting
+            else:
+              self.state = SpeedLimitAssistState.active
+
+        # PRE_ACTIVE
+        elif self.state == SpeedLimitAssistState.preActive:
+          if self.target_set_speed_confirmed:
+            self._update_confirmed_state()
+          elif self.pre_active_timer <= 0:
+            # Timeout - session ended
+            self.state = SpeedLimitAssistState.inactive
+
+        # INACTIVE
+        elif self.state == SpeedLimitAssistState.inactive:
+          pass
+
+    # DISABLED
+    elif self.state == SpeedLimitAssistState.disabled:
+      if self.long_enabled and self.enabled:
+        # start or reset preActive timer if initially enabled or manual set speed change detected
+        if not self.long_enabled_prev or self.v_cruise_cluster_changed:
+          self.long_engaged_timer = int(DISABLED_GUARD_PERIOD / DT_MDL)
+
+        elif self.long_engaged_timer <= 0:
+          if self.target_set_speed_confirmed:
+            self._update_confirmed_state()
+          else:
+            self.state = SpeedLimitAssistState.preActive
+            self.pre_active_timer = int(PRE_ACTIVE_GUARD_PERIOD / DT_MDL)
+
+    enabled = self.state in ENABLED_STATES
+    active = self.state in ACTIVE_STATES
+
+    return enabled, active
+
+  def update_state_machine_non_pcm_long(self):
+    self.long_engaged_timer = max(0, self.long_engaged_timer - 1)
+    self.pre_active_timer = max(0, self.pre_active_timer - 1)
+    self.speed_limit_changed_timer = max(0, self.speed_limit_changed_timer - 1)
+
+    # ACTIVE, ADAPTING, PENDING, PRE_ACTIVE, INACTIVE
+    if self.state != SpeedLimitAssistState.disabled:
+      if not self.long_enabled or not self.enabled:
+        self.state = SpeedLimitAssistState.disabled
+
+      else:
+        # ACTIVE
+        if self.state == SpeedLimitAssistState.active:
+          if self.v_cruise_cluster_changed:
+            self.state = SpeedLimitAssistState.inactive
+
+          elif self.speed_limit_changed and self.apply_confirm_speed_threshold:
+            self.speed_limit_changed_timer = int(SPEED_LIMIT_CHANGED_HOLD_PERIOD / DT_MDL)
+          elif self.speed_limit_changed_timer <= 0:
+            self.state = SpeedLimitAssistState.preActive
+            self.pre_active_timer = int(PRE_ACTIVE_GUARD_PERIOD / DT_MDL)
+
+        # PRE_ACTIVE
+        elif self.state == SpeedLimitAssistState.preActive:
+          if self._update_non_pcm_long_confirmed_state():
+            self.state = SpeedLimitAssistState.active
+          elif self.pre_active_timer <= 0:
+            # Timeout - session ended
+            self.state = SpeedLimitAssistState.inactive
+
+        # INACTIVE
+        elif self.state == SpeedLimitAssistState.inactive:
+          if self.speed_limit_changed:
+            self.speed_limit_changed_timer = int(SPEED_LIMIT_CHANGED_HOLD_PERIOD / DT_MDL)
+          elif self.speed_limit_changed_timer <= 0:
+            self.state = SpeedLimitAssistState.preActive
+            self.pre_active_timer = int(PRE_ACTIVE_GUARD_PERIOD / DT_MDL)
+          elif self._update_non_pcm_long_confirmed_state():
+            self.state = SpeedLimitAssistState.active
+
+    # DISABLED
+    elif self.state == SpeedLimitAssistState.disabled:
+      if self.long_enabled and self.enabled:
+        # start or reset preActive timer if initially enabled or manual set speed change detected
+        if not self.long_enabled_prev or self.v_cruise_cluster_changed:
+          self.long_engaged_timer = int(DISABLED_GUARD_PERIOD / DT_MDL)
+
+        elif self.long_engaged_timer <= 0:
+          if self._update_non_pcm_long_confirmed_state():
+            self.state = SpeedLimitAssistState.active
+          elif self._has_speed_limit:
+            self.state = SpeedLimitAssistState.preActive
+            self.pre_active_timer = int(PRE_ACTIVE_GUARD_PERIOD / DT_MDL)
+          else:
+            self.state = SpeedLimitAssistState.inactive
+
+    enabled = self.state in ENABLED_STATES
+    active = self.state in ACTIVE_STATES
+
+    return enabled, active
+
+  def update_events(self, events_sp: EventsSP) -> None:
+    if self.state == SpeedLimitAssistState.preActive:
+      events_sp.add(EventNameSP.speedLimitPreActive)
+
+    if self.state == SpeedLimitAssistState.pending and self._state_prev != SpeedLimitAssistState.pending:
+      events_sp.add(EventNameSP.speedLimitPending)
+
+    if self.is_active:
+      if self._state_prev not in ACTIVE_STATES:
+        events_sp.add(EventNameSP.speedLimitActive)
+
+      # only notify if we acquire a valid speed limit
+      # do not check has_speed_limit here
+      elif self._speed_limit != self.speed_limit_prev:
+        if self.speed_limit_prev <= 0:
+          events_sp.add(EventNameSP.speedLimitActive)
+        elif self.speed_limit_prev > 0 and self._speed_limit > 0:
+          events_sp.add(EventNameSP.speedLimitChanged)
+
+  def update(self, long_enabled: bool, long_override: bool, v_ego: float, a_ego: float, v_cruise_cluster: float, speed_limit: float,
+             speed_limit_final_last: float, has_speed_limit: bool, distance: float, events_sp: EventsSP) -> None:
+    self.long_enabled = long_enabled
+    self.v_ego = v_ego
+    self.a_ego = a_ego
+
+    self._has_speed_limit = has_speed_limit
+    self._speed_limit = speed_limit
+    self._speed_limit_final_last = speed_limit_final_last
+    self._distance = distance
+
+    self.update_params()
+    self.update_calculations(v_cruise_cluster)
+
+    self._state_prev = self.state
+    if self.pcm_op_long:
+      self.is_enabled, self.is_active = self.update_state_machine_pcm_op_long()
+    else:
+      self.is_enabled, self.is_active = self.update_state_machine_non_pcm_long()
+
+    self.update_events(events_sp)
+
+    # Update change tracking variables
+    self.speed_limit_prev = self._speed_limit
+    self.v_cruise_cluster_prev = self.v_cruise_cluster
+    self.long_enabled_prev = self.long_enabled
+    self.prev_target_set_speed_conv = self.target_set_speed_conv
+    self.prev_v_cruise_cluster_conv = self.v_cruise_cluster_conv
+    self.prev_speed_limit_final_last_conv = self.speed_limit_final_last_conv
+
+    self.output_v_target = self.get_v_target_from_control()
+    self.output_a_target = self.get_a_target_from_control()
+
+    self.frame += 1
diff --git a/sunnypilot/selfdrive/controls/lib/speed_limit/speed_limit_resolver.py b/sunnypilot/selfdrive/controls/lib/speed_limit/speed_limit_resolver.py
index f145b16c10..51fb8f6d64 100644
--- a/sunnypilot/selfdrive/controls/lib/speed_limit/speed_limit_resolver.py
+++ b/sunnypilot/selfdrive/controls/lib/speed_limit/speed_limit_resolver.py
@@ -57,6 +57,12 @@ class SpeedLimitResolver:
     self.offset_type = self.params.get("SpeedLimitOffsetType", return_default=True)
     self.offset_value = self.params.get("SpeedLimitValueOffset", return_default=True)
 
+    self.speed_limit = 0.
+    self.speed_limit_last = 0.
+    self.speed_limit_final = 0.
+    self.speed_limit_final_last = 0.
+    self.speed_limit_offset = 0.
+
   def update_speed_limit_states(self) -> None:
     self.speed_limit_final = self.speed_limit + self.speed_limit_offset
 
diff --git a/sunnypilot/selfdrive/controls/lib/speed_limit/tests/test_speed_limit_assist.py b/sunnypilot/selfdrive/controls/lib/speed_limit/tests/test_speed_limit_assist.py
new file mode 100644
index 0000000000..3b2716265d
--- /dev/null
+++ b/sunnypilot/selfdrive/controls/lib/speed_limit/tests/test_speed_limit_assist.py
@@ -0,0 +1,227 @@
+"""
+Copyright (c) 2021-, Haibin Wen, sunnypilot, and a number of other contributors.
+
+This file is part of sunnypilot and is licensed under the MIT License.
+See the LICENSE.md file in the root directory for more details.
+"""
+from cereal import custom
+
+from opendbc.car.car_helpers import interfaces
+from opendbc.car.toyota.values import CAR as TOYOTA
+from openpilot.common.constants import CV
+from openpilot.common.params import Params
+from openpilot.common.realtime import DT_MDL
+from openpilot.selfdrive.car.cruise import V_CRUISE_UNSET
+from openpilot.sunnypilot.selfdrive.car import interfaces as sunnypilot_interfaces
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.common import Mode
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit import PCM_LONG_REQUIRED_MAX_SET_SPEED
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.speed_limit_assist import SpeedLimitAssist, \
+  PRE_ACTIVE_GUARD_PERIOD, ACTIVE_STATES
+from openpilot.sunnypilot.selfdrive.selfdrived.events import EventsSP
+
+SpeedLimitAssistState = custom.LongitudinalPlanSP.SpeedLimit.AssistState
+
+ALL_STATES = tuple(SpeedLimitAssistState.schema.enumerants.values())
+
+SPEED_LIMITS = {
+  'residential': 25 * CV.MPH_TO_MS,  # 25 mph
+  'city': 35 * CV.MPH_TO_MS,         # 35 mph
+  'highway': 65 * CV.MPH_TO_MS,      # 65 mph
+  'freeway': 80 * CV.MPH_TO_MS,      # 80 mph
+}
+
+
+class TestSpeedLimitAssist:
+
+  def setup_method(self):
+    self.params = Params()
+    self.reset_custom_params()
+    self.events_sp = EventsSP()
+    CI = self._setup_platform(TOYOTA.TOYOTA_RAV4_TSS2)
+    self.sla = SpeedLimitAssist(CI.CP)
+    self.sla.pre_active_timer = int(PRE_ACTIVE_GUARD_PERIOD / DT_MDL)
+    self.pcm_long_max_set_speed = PCM_LONG_REQUIRED_MAX_SET_SPEED[self.sla.is_metric][1]  # use 80 MPH for now
+    self.speed_conv = CV.MS_TO_KPH if self.sla.is_metric else CV.MS_TO_MPH
+
+  def teardown_method(self, method):
+    self.reset_state()
+
+  def _setup_platform(self, car_name):
+    CarInterface = interfaces[car_name]
+    CP = CarInterface.get_non_essential_params(car_name)
+    CP_SP = CarInterface.get_non_essential_params_sp(CP, car_name)
+    CI = CarInterface(CP, CP_SP)
+    sunnypilot_interfaces.setup_interfaces(CI, self.params)
+    return CI
+
+  def reset_custom_params(self):
+    self.params.put("SpeedLimitMode", int(Mode.assist))
+    self.params.put_bool("IsMetric", False)
+    self.params.put("SpeedLimitOffsetType", 0)
+    self.params.put("SpeedLimitValueOffset", 0)
+
+  def reset_state(self):
+    self.sla.state = SpeedLimitAssistState.disabled
+    self.sla.frame = -1
+    self.sla.last_op_engaged_frame = 0
+    self.sla.op_engaged = False
+    self.sla.op_engaged_prev = False
+    self.sla._speed_limit = 0.
+    self.sla.speed_limit_prev = 0.
+    self.sla.last_valid_speed_limit_offsetted = 0.
+    self.sla._distance = 0.
+    self.events_sp.clear()
+
+  def initialize_active_state(self, initialize_v_cruise):
+    self.sla.state = SpeedLimitAssistState.active
+    self.sla.v_cruise_cluster = initialize_v_cruise
+    self.sla.v_cruise_cluster_prev = initialize_v_cruise
+    self.sla.prev_v_cruise_cluster_conv = round(initialize_v_cruise * self.speed_conv)
+
+  def test_initial_state(self):
+    assert self.sla.state == SpeedLimitAssistState.disabled
+    assert not self.sla.is_enabled
+    assert not self.sla.is_active
+    assert V_CRUISE_UNSET == self.sla.get_v_target_from_control()
+
+  def test_disabled(self):
+    self.params.put("SpeedLimitMode", int(Mode.off))
+    for _ in range(int(10. / DT_MDL)):
+      self.sla.update(True, False, SPEED_LIMITS['city'], 0, SPEED_LIMITS['highway'], SPEED_LIMITS['city'], SPEED_LIMITS['city'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.disabled
+
+  def test_transition_disabled_to_preactive(self):
+    for _ in range(int(3. / DT_MDL)):
+      self.sla.update(True, False, SPEED_LIMITS['city'], 0, SPEED_LIMITS['highway'], SPEED_LIMITS['city'], SPEED_LIMITS['city'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.preActive
+    assert self.sla.is_enabled and not self.sla.is_active
+
+  def test_preactive_to_active_with_max_speed_confirmation(self):
+    self.sla.state = SpeedLimitAssistState.preActive
+    self.sla.update(True, False, SPEED_LIMITS['city'], 0, self.pcm_long_max_set_speed, SPEED_LIMITS['highway'],
+                    SPEED_LIMITS['highway'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.active
+    assert self.sla.is_enabled and self.sla.is_active
+    assert self.sla.output_v_target == SPEED_LIMITS['highway']
+
+  def test_preactive_timeout_to_inactive(self):
+    self.sla.state = SpeedLimitAssistState.preActive
+    self.sla.update(True, False, SPEED_LIMITS['city'], 0, SPEED_LIMITS['highway'], SPEED_LIMITS['city'], SPEED_LIMITS['city'], True, 0, self.events_sp)
+
+    for _ in range(int(PRE_ACTIVE_GUARD_PERIOD / DT_MDL)):
+      self.sla.update(True, False, SPEED_LIMITS['city'], 0, SPEED_LIMITS['highway'], SPEED_LIMITS['city'], SPEED_LIMITS['city'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.inactive
+
+  def test_preactive_to_pending_no_speed_limit(self):
+    self.sla.state = SpeedLimitAssistState.preActive
+    self.sla.update(True, False, SPEED_LIMITS['highway'], 0, self.pcm_long_max_set_speed, 0, 0, False, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.pending
+    assert self.sla.is_enabled and not self.sla.is_active
+
+  def test_pending_to_active_when_speed_limit_available(self):
+    self.sla.state = SpeedLimitAssistState.pending
+    self.sla.update(True, False, SPEED_LIMITS['city'], 0, self.pcm_long_max_set_speed, SPEED_LIMITS['city'], SPEED_LIMITS['city'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.active
+
+  def test_pending_to_adapting_when_below_speed_limit(self):
+    self.sla.state = SpeedLimitAssistState.pending
+    self.sla.update(True, False, SPEED_LIMITS['city'] + 5, 0, self.pcm_long_max_set_speed, SPEED_LIMITS['city'], SPEED_LIMITS['city'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.adapting
+    assert self.sla.is_enabled and self.sla.is_active
+
+  def test_active_to_adapting_transition(self):
+    self.initialize_active_state(self.pcm_long_max_set_speed)
+
+    self.sla.update(True, False, SPEED_LIMITS['highway'] + 2, 0, self.pcm_long_max_set_speed, SPEED_LIMITS['highway'],
+                    SPEED_LIMITS['highway'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.adapting
+
+  def test_adapting_to_active_transition(self):
+    self.sla.state = SpeedLimitAssistState.adapting
+    self.sla.v_cruise_cluster_prev = self.pcm_long_max_set_speed
+    self.sla.prev_v_cruise_cluster_conv = round(self.pcm_long_max_set_speed * self.speed_conv)
+
+    self.sla.update(True, False, SPEED_LIMITS['city'], 0, self.pcm_long_max_set_speed, SPEED_LIMITS['highway'],
+                    SPEED_LIMITS['highway'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.active
+
+  def test_manual_cruise_change_detection(self):
+    self.sla.state = SpeedLimitAssistState.active
+    expected_cruise = SPEED_LIMITS['highway']
+    self.sla.v_cruise_cluster_prev = expected_cruise
+
+    different_cruise = SPEED_LIMITS['highway'] + 5
+    self.sla.update(True, False, SPEED_LIMITS['city'], 0, different_cruise, SPEED_LIMITS['city'], SPEED_LIMITS['city'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.inactive
+
+  # TODO-SP: test lower CST cases
+  def test_rapid_speed_limit_changes(self):
+    self.initialize_active_state(self.pcm_long_max_set_speed)
+    speed_limits = [SPEED_LIMITS['highway'], SPEED_LIMITS['freeway']]
+
+    for _, speed_limit in enumerate(speed_limits):
+      self.sla.update(True, False, speed_limit, 0, self.pcm_long_max_set_speed, speed_limit, speed_limit, True, 0, self.events_sp)
+    assert self.sla.state in ACTIVE_STATES
+
+  def test_invalid_speed_limits_handling(self):
+    self.initialize_active_state(self.pcm_long_max_set_speed)
+
+    invalid_limits = [-10, 0, 200 * CV.MPH_TO_MS]
+
+    for invalid_limit in invalid_limits:
+      self.sla.update(True, False, SPEED_LIMITS['city'], 0, self.pcm_long_max_set_speed, invalid_limit, SPEED_LIMITS['city'], True, 0, self.events_sp)
+      assert isinstance(self.sla.output_v_target, (int, float))
+      assert self.sla.output_v_target == V_CRUISE_UNSET or self.sla.output_v_target > 0
+
+  def test_stale_data_handling(self):
+    self.initialize_active_state(self.pcm_long_max_set_speed)
+    old_speed_limit = SPEED_LIMITS['city']
+
+    self.sla.update(True, False, SPEED_LIMITS['city'], 0, self.pcm_long_max_set_speed, 0, old_speed_limit, True, 0, self.events_sp)
+    assert self.sla.state in ACTIVE_STATES
+    assert self.sla.output_v_target == old_speed_limit
+
+  def test_distance_based_adapting(self):
+    self.sla.state = SpeedLimitAssistState.adapting
+    self.sla.v_cruise_cluster_prev = self.pcm_long_max_set_speed
+    self.sla.prev_v_cruise_cluster_conv = round(self.pcm_long_max_set_speed * self.speed_conv)
+
+    distance = 100.0
+    current_speed = SPEED_LIMITS['freeway']
+    target_speed = SPEED_LIMITS['highway']
+
+    self.sla.update(True, False, current_speed, 0, self.pcm_long_max_set_speed, target_speed, target_speed, True, distance, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.adapting
+    assert self.sla.output_v_target == target_speed  # TODO-SP: assert expected accel, need to enable self.acceleration_solutions
+
+  def test_long_disengaged_to_disabled(self):
+    self.initialize_active_state(self.pcm_long_max_set_speed)
+
+    self.sla.update(False, False, SPEED_LIMITS['city'], 0, self.pcm_long_max_set_speed, SPEED_LIMITS['city'],
+                    SPEED_LIMITS['city'], True, 0, self.events_sp)
+    assert self.sla.state == SpeedLimitAssistState.disabled
+    assert self.sla.output_v_target == V_CRUISE_UNSET
+
+  def test_maintain_states_with_no_changes(self):
+    """Test that states are maintained when no significant changes occur"""
+    test_states = [
+      SpeedLimitAssistState.preActive,
+      SpeedLimitAssistState.pending,
+      SpeedLimitAssistState.active,
+      SpeedLimitAssistState.adapting
+    ]
+
+    for state in test_states:
+      self.sla.state = state
+      self.sla.op_engaged = True
+
+      initial_state = state
+
+      self.sla.update(True, False, SPEED_LIMITS['city'], 0, self.pcm_long_max_set_speed, SPEED_LIMITS['city'], SPEED_LIMITS['city'], True, 0, self.events_sp)
+
+      assert self.sla.state in ALL_STATES  # Sanity check
+
+      if initial_state == SpeedLimitAssistState.preActive:
+        assert self.sla.state in [SpeedLimitAssistState.preActive, SpeedLimitAssistState.active]
+      elif initial_state in ACTIVE_STATES:
+        assert self.sla.state in ACTIVE_STATES
diff --git a/sunnypilot/selfdrive/selfdrived/events.py b/sunnypilot/selfdrive/selfdrived/events.py
index 7c723397fb..7700550c2d 100644
--- a/sunnypilot/selfdrive/selfdrived/events.py
+++ b/sunnypilot/selfdrive/selfdrived/events.py
@@ -1,6 +1,10 @@
+import cereal.messaging as messaging
 from cereal import log, car, custom
+from openpilot.common.constants import CV
 from openpilot.sunnypilot.selfdrive.selfdrived.events_base import EventsBase, Priority, ET, Alert, \
   NoEntryAlert, ImmediateDisableAlert, EngagementAlert, NormalPermanentAlert, AlertCallbackType, wrong_car_mode_alert
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit import PCM_LONG_REQUIRED_MAX_SET_SPEED, CONFIRM_SPEED_THRESHOLD
+from openpilot.sunnypilot.selfdrive.controls.lib.speed_limit.helpers import compare_cluster_target
 
 
 AlertSize = log.SelfdriveState.AlertSize
@@ -14,6 +18,49 @@ EventNameSP = custom.OnroadEventSP.EventName
 EVENT_NAME_SP = {v: k for k, v in EventNameSP.schema.enumerants.items()}
 
 
+def speed_limit_adjust_alert(CP: car.CarParams, CS: car.CarState, sm: messaging.SubMaster, metric: bool, soft_disable_time: int, personality) -> Alert:
+  speedLimit = sm['longitudinalPlanSP'].speedLimit.resolver.speedLimit
+  speed = round(speedLimit * (CV.MS_TO_KPH if metric else CV.MS_TO_MPH))
+  message = f'Adjusting to {speed} {"km/h" if metric else "mph"} speed limit'
+  return Alert(
+    message,
+    "",
+    AlertStatus.normal, AlertSize.small,
+    Priority.LOW, VisualAlert.none, AudibleAlert.none, 4.)
+
+
+def speed_limit_pre_active_alert(CP: car.CarParams, CS: car.CarState, sm: messaging.SubMaster, metric: bool, soft_disable_time: int, personality) -> Alert:
+  speed_conv = CV.MS_TO_KPH if metric else CV.MS_TO_MPH
+  speed_limit_final_last = sm['longitudinalPlanSP'].speedLimit.resolver.speedLimitFinalLast
+  speed_limit_final_last_conv = round(speed_limit_final_last * speed_conv)
+
+  if CP.openpilotLongitudinalControl and CP.pcmCruise:
+    # PCM long
+    cst_low, cst_high = PCM_LONG_REQUIRED_MAX_SET_SPEED[metric]
+    pcm_long_required_max = cst_low if speed_limit_final_last_conv < CONFIRM_SPEED_THRESHOLD[metric] else cst_high
+    pcm_long_required_max_set_speed_conv = round(pcm_long_required_max * speed_conv)
+    speed_unit = "km/h" if metric else "mph"
+    alert_2_str = f"Manually change set speed to {pcm_long_required_max_set_speed_conv} {speed_unit} to activate"
+  else:
+    # Non PCM long
+    v_cruise_cluster = CS.vCruiseCluster * CV.KPH_TO_MS
+
+    req_plus, req_minus = compare_cluster_target(v_cruise_cluster, speed_limit_final_last, metric)
+    arrow_str = ""
+    if req_plus:
+      arrow_str = "RES/+"
+    elif req_minus:
+      arrow_str = "SET/-"
+
+    alert_2_str = f"Operate the {arrow_str} cruise control button to activate"
+
+  return Alert(
+    "Speed Limit Assist: Activation Required",
+    alert_2_str,
+    AlertStatus.normal, AlertSize.mid,
+    Priority.LOW, VisualAlert.none, AudibleAlert.none, .1)
+
+
 class EventsSP(EventsBase):
   def __init__(self):
     super().__init__()
@@ -148,5 +195,33 @@ EVENTS_SP: dict[int, dict[str, Alert | AlertCallbackType]] = {
       "",
       AlertStatus.normal, AlertSize.small,
       Priority.LOW, VisualAlert.none, AudibleAlert.none, 1.),
-  }
+  },
+
+  EventNameSP.speedLimitActive: {
+    ET.WARNING: Alert(
+      "Automatically adjusting to the posted speed limit",
+      "",
+      AlertStatus.normal, AlertSize.small,
+      Priority.LOW, VisualAlert.none, AudibleAlert.none, 5.),
+  },
+
+  EventNameSP.speedLimitChanged: {
+    ET.WARNING: Alert(
+      "Set speed changed",
+      "",
+      AlertStatus.normal, AlertSize.small,
+      Priority.LOW, VisualAlert.none, AudibleAlert.none, 5.),
+  },
+
+  EventNameSP.speedLimitPreActive: {
+    ET.WARNING: speed_limit_pre_active_alert,
+  },
+
+  EventNameSP.speedLimitPending: {
+    ET.WARNING: Alert(
+      "Automatically adjusting to the last speed limit",
+      "",
+      AlertStatus.normal, AlertSize.small,
+      Priority.LOW, VisualAlert.none, AudibleAlert.none, 5.),
+  },
 }