This project is developed for the user to have accident alter in modern traffic system. This device can be used in highly accident area and pin drop curves to avoid accidents. It consists of two transmitter and two receivers ,One transmitter is connected first (One arm of the curve) and a receiver is fixed just opposite to the transmitter . The other transmitter is connected at the same side (other arm of the curve) and the receiver is fixed just opposite to the second transmitter. When the vehicle passes the first transmitter and receiver unit (One arm of the curve ),it sensor that one vehicle is crossing When it crosses the second unit (Other arm of the curve). It also senses , the microcontroller unit calculate the speed= displacement/time taken .if the speed exceeds the particular value ,It sends signal to the other side vehicle to be alert .it also alerts the other side vehicle some one crosses one side.