Discharge Headway Time Distribution Model on Congested Signalized Intersections and their Operation Management: A Case Study in Baghdad City

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A discharge headway time is an essential parameter in the theory of traffic flow that largely utilized in various sections of engineering transport. Discharge time headway is a necessary traffic measure used widely in the analysis of signalized intersection. This research focuses on the comprehensive analysis and regression model of vehicle discharge headway at signalized intersections and applied operation management using upstream access points. A comparison of median and mean values of discharge saturation headway indicated that the median of (2.230sec.) is less than mean of (2.5272sec.). That means the concentration of small time headways and most of drivers select headways less than the mean value which cause high risk-potential for drivers and reduced safety performance at signalized intersections. Higher values of discharge headway were found to be (4.13sec.), (3.12 sec.) and (3.08sec.) for Al-Nakhala intersection, Al-Sakhara Intersection and Bairuit Intersection respectively The induced of upstream access management improved the saturation flow rate to (28%) for Al-Sakhara Intersection and (31%) for Al-Nakhala Intersection that indicated normal traffic operation with less congestion to a better operation conditions.