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.