Technique to improve the file transfer outcomes between road side unit and vehicles in vehicular ad-hoc networks Driving means frequently changing location. This, is in turn, means a regular need for information on the current location and specifically for data on the surrounding traffic And there is necessitate of Technique for handling the network connection during the multi-hop data exchange between road side unit and vehicle(V2I) and between vehicles (V2V). Although need for information relate to the close environment of the car is observable, so far no inter vehicle communication systems for data exchange between vehicles and between roadside and number of vehicles has been put into operation. We know driving means continuously change the location so there is need of multi-hop data communication. This study focus on the techniques for multi-hop data (information) exchange on the road between road side unit and vehicle using VANET in a resourceful manner. So here in this paper we study the connectivity aware routing and multipath TCP to improve the file transfer outcomes between road side unit & vehicles. We will also focus on developing implementation of multipath TCP on NS-2. And compare the performance of connectivity aware routing & multipath TCP during the multi-hop data exchange between road side unit and vehicles. When used in mobile scenario MPTCP is found to provide some profit to active 3G connection by detecting and utilization road side Unit.