VANETs have e me r g e d a s a n e x c it ing research and application are Increasingly vehicles are being equipped with embedded sensors, processing and wireless communication capabilities opening a myriad of possibilities for powerful and potential life changing applications on safety, efficiency, comfort, public collaboration and participation while they are on the road. Although, considered a special case of a Mobile Ad Hoc Networks, VANET Sholdavital feature the possibility to affect people’s life or death decisions. Due to the particular characteristics, from highly dynamic topology to intermittent connectivity, VANETs have great challenges lie ahead, to mention a few: different application QoS requirements, and conflicting privacy and safety issues. In this paper, a view of VANETs is presented from the communication and application challenges perspective. In this paper, we propose a framework for rapid message dissemination that combines the advantages of diverse communication and cloud computing technologies. Specifically, we propose a novel Cloud-assisted Message Downlink dissemination Scheme (CMDS), with which the safety messages in the cloud server are first delivered to the suitable mobile gateways on relevant roads with the help of cloud computing (where gateways are buses with both cellular and VANET interfaces), and then being disseminated among neighboring vehicles via vehicle-to vehicle (V2V) communication.