Delay in Oversaturated Flow Condition at Signal Controlled Intersection under Heterogeneous Traffic Scenario

Abstract

The delay in travel time varies based on the traffic flow conditions. Undersaturated flow condition requires less time to clear the traffic at the stop line of a signal than oversaturated traffic flow. Several models are available to estimate the delay due to oversaturated flow conditions at intersections but they are mainly based on homogeneous traffic conditions. To address this issue, a modified delay model is developed for oversaturated flow conditions at signal controlled intersections under heterogeneous traffic scenarios. Different ranges of volume capacity ratio have been considered and the duration of the red phase has been added while developing the model. The queue length concept was used for measuring the field delay. The model was generated using the data from three cities and validation was done based on the data of four different cities. Ninety-five percent accuracy in delay estimation was observed using the modified delay model.