Abstract: Vehicular Ad Hoc Networks (VANETs) have the potential to increase the safety, efficiency and convenience of transportation systems. Therefore, VANETs present many unique networking research challenges and the design of an effective routing protocol for VANETs is very crucial. Traditional position based approaches try to forward data with best-known neighbour finding that is typically the neighbour closest to the next junction in a greedy forwarding way. The aim of this study is to design an Opportunistic Position Based (OPB) approach which is based on forwarding data packets using the optimal path without using any location service. Also this schema, instead of flooding a message to all reachable vehicles, immediately will maintain the message for duration of time. Therefore, it can substantially reduce hop count. Moreover, without using the traditional flooding scheme in Ad-hoc and mobile network, we can guarantee the delivery of the message to all reachable vehicles for a period of time in sparse and dense traffic scenarios. Lastly, OPB compares with three other techniques under realistic scenarios and the effects of changing vehicles density are analyzed.