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Pedestrians are one of the road users who have the right to receive priority on security and comfort on the highway. Highway users such as vehicle users often violate traffic lights so that pedestrian crossing facilities are taken right. That makes pedestrians feel insecure when crossing the road. With these problems, a tool is designed to provide a warning and prevention of traffic accidents on highways, especially in pedestrian crossing areas by spraying water as a warning medium for traffic light offenders. The system is able to detect traffic violations based on changes in the value of the position of the vehicle against the stop line obtained from the Ultrasonic HC-SR04 sensor. When a violation is detected, the system turns on the pump to spray water to traffic violators as a deterrent effect. From the results of the experiment, results in lane A state that the vehicle located closest to the sensor is precision 94%, recall 88%, accuracy 85%, lane B vehicle position in the center, precision 73%, recall 100%, accuracy 75%, and in lane C the vehicle is the furthest value 75% precision, 100% recall, 85% accuracy