Abstract—Passenger safety is the prime concern in modern day vehicles, especially in driverless automobiles. Collision warning and collision avoidance systems are the latest emerging automotive safety technologies that assist the automobiles, especiallsy cars in avoiding accidents. Alarming statistics of accidents and increased number of vehicles on road demands for an intelligent safety mechanism that helps the car in handling a type of immediate precarious situation, specifically a sudden probability of a rear- end collision. Accidents due to rear end collision is one of the major problems encountered in cars, because of the ordinary succeeding vehicle, which is not trained to respond automatically and instantaneously to react to sudden halts and other emergency situations. When a car decelerates or halts suddenly by sensing an , the following vehicle tends to collide at the rear as it does not have the knowledge and capacity to respond to this unexpected situation. This results in serious damage to both the vehicles, posing a very big danger to passengers within the vehicles. The solution to this impending danger can be eliminated by extensively employing different electronic sensors and protocols like CAN(Controller Area Network) .The ARM processor keeps a continuous check on vehicle parameters using MEMS sensor and temperature sensor and gas sensor. The CAN controller on receiving the equivalent results, is used to communicate within the car. This avoids collision between the cars.