Abstract
The objective of this paper is to the estimate delay time at two important intersections in Baghdad City using Highway Capacity Manual Model (HCM) ,which is widely used for estimating delay at signalized intersections in Iraq, and Signalized and Unsignalized Intersection Design and Research Aid (SIDRA INTERSECTION 4) Model. Field traffic volumes and control delay were measured during peak and off-peak periods. Data on geometric design elements and signal timings and phasing were measured through a field survey. The results of the analysis indicated that SIDRA INTERSWCTION4 using HCM model was found to be the best in the comparison with the field values by observed percent of difference. Therefore a proposed model is build by derive a new parameters of the uniform delay term (d1) and random delay term (d2) for non-lane state. This model is validated on Art College Intersection. The results show that the predicted model cannot be used for other intersections. Then a proposed model is build for Art College Intersection.
