The main concern of this project is to overcome the road accidents and the safety of the peoples or the family members from road accidents. So to overcome this issue we are working on this project to detect the speed of the vehicles with the help of the ultrasonic system and Arduino board. When the vehicle has come in the range of the ultrasonic system then they start detecting their speed and if their speed has been exceeding from the speed limit of the road then they send the signals to Arduino and the motor turn on the speedbreaker and if the vehicle having in there normal speed then the speedbreaker remains constant.