Research on desirable adaptive cruise control behavior in traffic streams

This report describes a research program focused on the influences of adaptive cruise control (ACC)-equipped vehicles on traffic behavior. The program is directed at increasing the understanding of how various modes of motion occur and in developing microscopic knowledge that can be applied in assuring that strings of ACC vehicles will not have an adverse effect on traffic flow. The report first discusses the concepts used in designing a driver model. Parameters used in representing steady following and transient behavior are described. Simulation results are presented regarding inherently sustainable strings. Traffic flow characteristics related to longitudinal control properties are then described. The report presents conclusions and findings from this phase 2 research as well as recommendations for applying the findings from both phases 1 and 2.