DELAY MODEL FOR UNCONTROLLED INTERSECTIONS IN MIXED TRAFFIC CONDITIONS
Keywords:
Gap Acceptance, Capacity, Critical Gap, Follow-up Time, Delay, Uncontrolled intersectionAbstract
Intersections are the critical zones where vehicles make different manoeuvres and want to occupy the same space at the same time. As the vehicle reaches the intersection the driver of the subject vehicle has to take quick decision considering the intersection geometry, speed and vehicles present near the intersection. In developed countries like India, heterogeneous traffic exists, consisting of varied sizes of vehicles and lack of lane discipline. Due to absence of lane discipline, the small sized vehicles try to accept the available gaps, causing delay to the major stream flow which in turn affects the intersection capacity. In this study, capacity of the intersection is estimated by gap acceptance method, and data was collected from three uncontrolled three-legged intersections covering various regions of India. The parameters extracted from the video include critical gap, follow-up time, stopped delay and total time to cross the intersection for each vehicle type. Gap Acceptance Method is used for mixed traffic condition because it is based on the critical gap and follow-up time, which depends on the type of vehicle and traffic conditions. This study tries to develop a Multiple linear regression (MLR) model for delay and compares the capacities of Uncontrolled intersection (UCI) with different gap acceptance model like Drew’s model, Harder Model, Modified Siegloch model, Luttinen’s model and Highway capacity manual (HCM) 2010. It was observed that critical gap is influenced by the size of the vehicle and traffic volume. There is also an increase in delay as the size of vehicle increases.
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