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In this paper, the authors propose a simple concept for emergency information dissemination in vehicular ad-hoc networks. Instead of competing for the shared wireless medium when transmitting the emergency information as proposed by many authors, they require nodes to cooperate by synchronizing their transmissions. The proposed scheme is backward compatible with IEEE 802.11p carrier sense multiple access with collision avoidance. They also briefly address implementation issues of the proposed scheme. In July 2010 the IEEE 802.11p standard has been ratified, which specifies PHYsical (PHY) and Medium Access Control (MAC) extensions to provide wireless access in vehicular environments.
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