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Technical Approach

The communication technology for cooperative ITS and Car-2-Car Communication is derived from the standard IEEE 802.11, also known as Wireless LAN and a frequency spectrum in the 5.9 GHz range has been allocated on a harmonised basis in Europe in line with similar allocations in USA. As soon as two or more vehicles or ITS stations are in radio communication range, they connect automatically and establish an ad hoc network where all ITS stations know the position,  speed and direction of the other stations and will be able to provide warnings and information.
As the range of a single Wireless LAN link is limited to a few hundred meters, every vehicle is also router and allows sending messages over multi-hop to farther vehicles and ITS stations. The routing algorithm is based on the position of the vehicles and is able to handle fast changes of the ad hoc network topology.