Abstract: Data indicative of an instantaneous location, a destination and a route from the instantaneous location to the destination are transmitted from a motor vehicle navigation unit to a central unit. Traffic information about the route between the instantaneous location and the destination are transmitted from the control unit to the vehicle unit. The received traffic information data are used by the vehicle unit to determine a desirable route between the instantaneous location and the destination given the traffic information. The data of the route thus determined are made available to the vehicle driver, so that he is able to steer toward his desired destination along this specified route.

Abstract: A method is for describing and generating road networks for determining traffic information or road traffic data and/or for determining the traveling times on routes or stretches of routes by at least one mobile detector. The mobile detector includes a position determining device and a device for data communication with a control center. A road network is for determining traffic information and/or for determining the traveling time by at least one mobile detector, e.g., a vehicle. The road network and/or parts of the road network are substantially described by node and/or contour points.

Abstract: A vehicle route between an instantaneous location and a destination is calculated, such that data about the instantaneous location and the destination are determined in the vehicle as data (A) about the current route, traffic information data are delivered from a central traffic information data memory to a traffic network, the delivered traffic information data are used to calculate the route in the traffic network between the instantaneous location and the destination location, the data of the calculated route and the data about the current route are made available to the driver, characterized in that the data about the current route are transmitted from the vehicle to the central traffic information data memory, and, as the response to the transmission of data (A), traffic information data are delivered about the current route.