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Travel Time estimation and reliability measurement are important issues for improving operational efficiency and safety of traffic road networks; therefore, an effective and dependable transportation infrastructure that provides accessibility and promotes the safe and efficient movement of people and commodities is critical to a nation's or region's economy. This paper aims to compute travel time reliability for a part of (Abi Talep) urban arterial street in Baghdad city of Iraq capital starting from (Al-Shaab bridge intersection) to (Al – Nidaa intersection) is considered one of the busiest and most important links of this arterial to provide a database for estimating travel time and actual travel time for drivers and passengers using this arterial street. Buffer time index harms reliability. Link (2) from Army Canal intersection to Al-Seelaikh intersection had a buffer index of about 74.5 percent, link (4) from Qahira intersection to Al-Nidaa intersection had a 66.6 percent buffer index, but Link (1) from Al-Shaab bridge intersection to Army Canal intersection had a buffer index of about 62 percent. Finally, link (3) from the Al-Seelaikh intersection to the Qahira intersection had a 60.7 percent buffer index. During the peak period, the reliability of links (2), (4), (1), and (3), respectively, deteriorates. In terms of 95 percent percentile travel time, an extra delay detects on links (1), (2), (3), and (4), which are (299, 75, 168, and 733) sec. correspondingly. For link, a higher result for 95 percent travel time is obtained (4). The travel time index (TTI) for links 1, 2, 3, and 4 is 11.5 percent, 2.92 percent, 2.1 percent, and 6.32 percent, respectively. For links 1, 2, 3, and 4, the values of (PTI) planning time index is 18.6 %, 5.1 %, 3.3 %, and 10.5 %, respectively. [ABSTRACT FROM AUTHOR]

Currently in Baghdad traffic congestion has become one of the top proprieties for daily commuters. The delay due to traffic congestion is the worst that the capital citizen has experienced for decades. That delay can take the shape of grocery store check-out lines, and lengthy waits for a table at a famous restaurant. Automobile congestion has myriad impacts, from wasted gasoline and delivered emissions to frayed nerves, extra pricey items, and increased crash rates. Its clearest effect is delay, or misplaced time. Baghdad city suffered from excessive traffic congestion. Particularly in the current few years, and this ordinary in the absence of any new techniques and traffic administration research to qualify several of the reverse effects of congestion noted above. Therefore, this paper introduces new measurements of travel time reliability which are essential to understand how travel time fluctuates throughout day hours, days, of week, and weeks of month for (three) routes of Palestine urban arterial street at the Rusafaa part in Baghdad city of Iraq from (Al-Muaal) intersection to (Beirut square) intersection, on the other hand, the Buffer time index has the worst indicator on reliability. route (3) had a buffer index of roughly 78 percent, route (1) had a buffer index of 64.3 percent, route (2) had a buffer index of 46 percent, this means that the reliability to be worst of link (3), (1), and (2) respectively. Furthermore, the buffer time will be added to the average travel time is 107.5, 60.8, and 160 sec. for routes 1, 2, and 3, respectively. In addition to the 95% percentile travel time of observed routes which presents the additional delay measured on each route 275, 193, and 365 sec. for Link 1, 2, and 3 sequentially. The highest value of 95% travel time is measured for Route (3). But the values of overall time a tripper ought to permit to ensure on-time arrival for each route is called planning time index (PTI) is 5.87%, 8.17%, and 12.87% for Routes 1, 2, 3 sequentially larger value of planning time index is recorded of Route (3). [ABSTRACT FROM AUTHOR]