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VANETs (vehicular ad hoc networks) are emerging as a new network environment for intelligent transportation systems. Many of the applications built for VANETs will depend on the communications technology that vehicles exchange the information by using wireless LAN without any base stations. So, it is important to provide strict delay guarantees and high throughput performance on wireless vehicular mobility environments. However, legacy IEEE802.11 DCF protocol lacks support for quality of service differentiation and degraded channel utilization. This paper presents a cross layer sheme of fragmentation and priority scheduling, which is approach focusing on time varying property of the wireless channel and networks load condition. Simulation results show that our cross layer scheme may provide timely delivery guarantees to different classed of real time date traffic, and increase the vehicular ad hoc networks throughput.