Majority of the highway capacity manuals consider control delay as the service measure for assessing the operational conditions at signalized intersection.As sophisticated devices are required to measure the control delay from the field, the control delay values are estimated based on the field measured stopped delays. For this purpose, the United States Highway Capacity Manual 2010 (HCM 2010) uses a stopped delay to control delay conversion factor of 1.3. The Indian traffic is characterized by the presence of heterogeneous vehicle type and presence of loose lane discipline. Due to these fundamental differences, the direct applicability of the above value to Indian scenario may be questionable. Through this study, an attempt has been made to estimate the stopped delay to control delay conversion factor for Indian traffic condition. Racelogic VBOX GPS speed data recorder has been used for collecting the vehicle trajectory data. From the study, the stopped delay to control delay conversion factor is obtained as 1.19 for Indian traffic condition. This factor accounts for the acceleration and deceleration of the vehicles while traversing the intersection.
Darshana Othayoth and K.V. Krishna Rao
Indian Institute of Technology Bombay
General, Urban Mobility