In most of the automobile system avoiding collision is a critical issue. A “Vehicle Collision Avoidance System” in an automobile system is a safety system that is designed to reduce the chances of collision .Collision avoidance is one of the most important issues in controlling vehicles automatically. The job of driving vehicles can be made easier by the use of these system, as well as these system ensures to manage the traffic efficiently with road safety. In this paper we consider a VANET scenario for road side safety and to solve the emergency situation. To improve the performance for large scale network having large traffic and communication between vehicles is done by using routing protocol. Here we introduce a PUMA protocol and compare its results. Also we apply Genetic Algorithm on this protocol for the path optimization to achieve maximum results. By varying number of vehicles (nodes) mean throughput, mean delay, jitter, PDR has been calculated. In this paper application and future scope of VANETs is also introduced.