Abstract
In Baghdad city, Iraq, the traffic volumes have rapidly grown during the last 15 years. Road networks need to reevaluate and decide if they are operating properly or not regarding the increase in the number of vehicles. Al-Jadriyah intersection (a four-leg signalized intersection) and Kamal Junblat Square (a multi-lane roundabout), which are two important intersections in Baghdad city with high traffic volumes, were selected to be reevaluated by the SIDRA package in this research. Traffic volume and vehicle movement data were abstracted from videotapes by the Smart Traffic Analyzer (STA) Software. The performance measures include delay and LOS. The analysis results by SIDRA Intersection 8.0.1 show that the performance of the roundabout is better than the signalized intersection but experiences high delay, and low LOS. Therefore, alternatives are proposed to improve the performance for current and future traffic volumes with low-medium delays.
Highlights
Road traffic congestion comprises several complex procedures and incorporates numerous components cooperating simultaneously
The problem of increasing traffic volume is that the absorptive capacity of the roads is not able to accommodate the traffic flow at peak hours resulting in traffic congestion and accidents
LOS is determined based on the delay for a signalized intersection, the LOS of all the approaches of Al-Jadriyah intersection and the intersection itself is F according to the HCM2010 method due to the high delay as the result of high traffic volume and the inadequate geometric dimensions of the intersection to discharge this high volume functionally [8, 25]
Summary
Road traffic congestion comprises several complex procedures and incorporates numerous components cooperating simultaneously. Authors in [13] used SIDRA to evaluate LOS and delays of the Al-Turkman Roundabout in Baghdad to improve its performance by proposing planning procedures to address the traffic jam and congestion problems in this area. Authors in [15] examined two signalized intersections using Sidra Intersection 5.1 based on the Australian, and American HCM methods and proposed new cycle times to improve their performance. Authors in [16] studied the performance of three 4-leg signalized intersections and four roundabouts in Karbala city, Iraq using SIDRA Intersection and proposed alternatives for performance improvement. Authors in [18] studied the operational performance of one highway, three intersections, and seventeen urban roads in AlKadhimiya, Baghdad, with the HCS2000 software and proposed performance improvement alternatives. Total delay was sufficiently decreased, and the operational performance improved for all intersections
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