Transportation models use volume delay functions, especially for assigning traffic to the network. For major roads in urban areas, such volume delay functions are missing. This is a serious lack, particularly for the modelling of urban traffic. This research project help to solve this problem. Extensive traffic surveys on the relationships between delays and volumes on typical urban roads provide the data needed to set up micro simulation models for the simulation of typical constellations in urban areas. For the simulation runs typical patterns of effects disturbing traffic flows, such as pedestrian crossings, bus stops, etc. are assumed.