Control delay variability at signalized intersection based on HCM method

The 2000 Highway Capacity Manual (HCM) designates mean control delay as the primary performance measure for signalized intersections. Considering the variability of delay, more reliable signal control strategies may be generated resulting in improved LOS of signalized intersections. This research was to determine the set of variables that affect control delay at signalized intersection. SIDRA and Transyt-7F, the widely used capacity software which determine the delay based on HCM methods was utilized in this study. At alpha = 0.05, the research indicated that only cycle time, intergreen time, no. of phasing, no. of lane and LTOR have a significant correlation. LTOR type of turning movement if allowed will significantly reduce the intersection control delay.