Computer simulation models were developed to analyze the delay to bicycles and motor vehicles at crossings and intersections where the two types of vehicles interact. The objective was to generate some understanding of the level of delay to each type of vehicle under various methods of traffic control and combinations of traffic conditions. Observational experiments on bicycle traffic behavior and interactions between bicycles and motor vehicles were carried out in the field, and the models were structured based on these data. The basic elements and assumptions of the simulation models are presented, and the behavior of bicyclists observed in traffic in the field is reported.