In developing countries accident is the major cause of death. If we gaze at the top 10 dangerous roads in the world we can see that all of them are mountain roads will be narrow. In the kinds of situations the driver of a vehicle cannot see the vehicles coming from opposite side.This is done by keeping an ultrasonic sensor is one side of the road before the curve and keeping a LED light after the curve, so that if vehicle comes from one end of the curve sensor senses and LED light glows at the opposite side. By looking at the LED light on/off criteria driver can become alert and can slow down the speed of the vehicle.