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Abstract
LI-FI two vehicles are communicated with the help of LEDs bulbs with the help of transmitter and receiver circuit.LI-FI technology the road accident can be controlled and much human life can be saved. A very chip device called as ultrasonic sensor which is used to measure the distance is used here just to communicate the two vehicles when they comes in the contact in some range which is preferred for the ultrasonic sensor. Using this LI-FI the data are transmitted from one vehicle to another. This technology was introduced few years back, which needs more systematic enquiry on its sustainability for traffic control purpose. This concept can be implemented at very low cost and with higher efficiency. At present, the day to day activities use lot of LEDs based lights for illumination, which can also be used for communication because of the advantages like fast switching, high power efficiency and safe to human vision. We are find the distance and alert the vehicle using light source. LDR absorb the light source to transmit the controller. Reduce the accident because we are using control of vehicle move on same path. Ultrasonic sensors find the distance from the rear of the vehicle.