This paper studies a routing protocol used in the application of collecting real-time traffic informationusing mobile vehicles to monitor traffic status. The biggest challenge of vehicular ad hoc network routingprotocol lies in the mismatch between the direction of moving vehicles and routed data. In order to dealwith this mismatch, a mesh based routing protocol with a two-tier network architecture is proposed. Byusing mesh nodes deployed at intersections, data can be routed through an optimized path which can improvethe delivery ratio and reduce the consumption of network resources. The simulation uses the mobilitymodel processed from the GPS data of taxis running in Shanghai urban areas. The result shows that theproposed protocol outperforms the existing flooding protocol.
