diff --git a/algorithms.py b/algorithms.py
index 69c6e83..770ebfe 100644
--- a/algorithms.py
+++ b/algorithms.py
@@ -939,6 +939,7 @@ class IllegalParkingAlgorithm:
                 self.state_start_time = None
                 self._last_alarm_id = None
                 self._parking_start_time = None
+                self.alert_cooldowns.clear()  # 车辆离开后清冷却，新车违停可正常告警
                 logger.debug(f"ROI {roi_id}: CONFIRMING_CLEAR → IDLE")
 
         return alerts
@@ -1175,6 +1176,7 @@ class VehicleCongestionAlgorithm:
                 self.state_start_time = None
                 self._last_alarm_id = None
                 self._congestion_start_time = None
+                self.alert_cooldowns.clear()  # 拥堵消散后清冷却，再次拥堵可正常告警
                 logger.debug(f"ROI {roi_id}: CONFIRMING_CLEAR → NORMAL")
 
         return alerts