Intelligent transport system (ITS) has large potentials on road safety applications as well as nonsafety applications. One of the\r\nbig challenges for ITS is on the reliable and cost-effective vehicle communications due to the large quantity of vehicles, high\r\nmobility, and bursty traffic from the safety and non-safety applications. In this paper, we investigate the use of dedicated shortrange\r\ncommunications (DSRC) for coexisting safety and non-safety applications over infrastructured vehicle networks. The main\r\nobjective of this work is to improve the scalability of communications for vehicles networks, ensure QoS for safety applications,\r\nand leave as much as possible bandwidth for non-safety applications. A two-level adaptive control scheme is proposed to find\r\nappropriate message rate and control channel interval for safety applications. Simulation results demonstrated that this adaptive\r\nmethod outperforms the fixed control method under varying number of vehicles
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