Vehicular communication is an important and emerging area of research in the field of vehicular technology. The improvement of programming and equipment in correspondence frameworks prompts the era of new systems. Many researches and projects have been conducted in this upcoming area. Many government projects have been implemented in the USA, Japan and the European Union. The principle goal of utilizing this new technology is to make an accident free environment. New architectures, protocols and implementations of vehicular ad-hoc network (VANET) have been made in recent years to provide Intelligent Transportation Services. This paper incorporates survey of overall examination chip away at different issue identified with TCP in VANET. The main issue is Congestion when congestion occur number of packets are drops, some packets are also lost. To overcome this problem congestion control algorithm is used when congestion occur this algorithm slow down the transmission rate. Additionally VANET has number of difficulties like technical, social and economical. To solve this issue numerous procedures to be utilized because of this it enhances bandwidth utilization and throughput.