VANET is an emerging technology to achieve intelligent intervehicle transmission and result if VANET. It Mostly resembles criteria remain same. The speed and choice of the path describe the dynamic topology [2] of VANET. If we assume two vehicles moving away from each other with a speed of 60 mph. Some of the well known ad hoc routing protocol such as AODV (Ad Hoc on demand distance vector) and DSR (Dynamic source routing) are therefore can be applied to VANET as well. VANET provides a wide range of applications like safety of vehicles on roads, driver assistance, sharing traffic and determining road conditions for smooth flow of traffic. In this paper various systems using collision avoidance [8] and provides the road safety using ITS (Intersection collision avoidance), CWAS (collision warning avoidance system), and the most appropriate simulation tools to simulate VANET protocol and applications). VANET has the tremendous challenges in roadside areas because VANET having the potential to avoid the traffic accidents and having efficiency. Recent research have been placed the VANET design architectures and implementations. Nowadays VANET research work have been focuses on the including areas like routing, broadcasting, Quality of Service (QoS), and security. We survey some of the research results in these areas.