As much as possible traffic areas of application with a uniform geographical data format are to be supported by the GDF. GDF was published in the version 3.0 on 12 October 1995. It raises the requirement professional users and organizations, which referenced and structured road system data develop, raises, tends, distributes or appropriate software produces to support. The effectiveness of the use of such data is to be improved by this general data format. The GDF is an application-independent data exchange format, which is to fulfill the request of the road transport and the traffic telematics ( http://www.ertico.com/gdf/index.htm).