Most researches in the VANETs domain concentrate on the development of communication routing protocols. However, it is not effective to apply the existing routing protocols of MANETs to those of VANETs. In this paper, we propose a new greedy forward routing protocol which leverages real time traffic flow information to create a routing policy. Based on this routing policy, the proposed protocol alleviates the influence of high dynamic topology and decreases the average delivery delay on VANETs.