This paper proposes a model which deals with the realtime signal control for an oversaturated network. Traffic signal, as an essential element of an urban transportation network plays a critical role in the operation of urban street network and could not be neglected along with the movement of ITS. Over the past few decades the study on signalised intersections has been carried out by various methods, however, still it is well accepted the benefit of signal control has not been fully realised. In general, current researches on traffic signal control can be grouped into two classes from the view of flow-capacity situation, i.e. under-saturation and congestion control. The models concerning with the under-saturated flow condition serve well from isolated intersection to network control. However for a congested or over-saturated network, most of the procedures were based upon experience or simple analysis. A realtime signal control model for an oversaturated network currently does not exist.
Abstract