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Traffic Telematics of the Mannesmann group is based on the use and linking of bi-directional mobile data telecommunication and position determination via satellite. The existing infrastructures can be used to realize a multitude of traffic telematics services, which cover a wide spectrum, from information services and emergency calls to individual dynamic route guidance and the closed feedback loop of traffic situation analysis and traffic control. Three elements are needed for a traffic telematics system to be effective: a center that provides the necessary services, a mobile telecommunications network capable of transmitting both speech and data, a vehicle information system that provides the man-machine interface and determines the vehicle's position.