  In this paper we have discussed about the number of automobiles that has been
increased on the road in the past few years. Due to high density of vehicles,
the potential threats and road accident is increasing. Wireless technology is
aiming to equip technology in vehicles to reduce these factors by sending
messages to each other. The vehicular safety application should be thoroughly
tested before it is deployed in a real world to use. Simulator tool has been
preferred over out door experiment because it simple, easy and cheap. VANET
requires that a traffic and network simulator should be used together to
perform this test. Many tools exist for this purpose but most of them have the
problem with the proper interaction. Simulating vehicular networks with
external stimulus to analyze its effect on wireless communication but to do
this job a good simulator is also needed.
