Open AccessTraffic Characteristics of Two-WayTwo-Lane (TWTL) Highway in Iraq: Al-Mishkhab Road As A Case Study
Author(s) -
Ahlam K. Al-Zerjawi,
Hamid Athab Al-Jameel,
Sajad A. Zagroot
Publication year - 2020
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/888/1/012030
Subject(s) - headway , transport engineering , traffic flow (computer networking) , traffic speed , flow (mathematics) , vehicle type , computer science , environmental science , engineering , mathematics , computer security , geometry
Two-Way Two-Lane (TWTL) highways have been developed rapidly throughout the world, and they represent a large percentage of the road network spread about the world. In Iraq, this type of road still has also been adopted widely. Therefore, this study tries to investigate the two-way, two-lane highway characteristics because very few studies have been devoted to studying this topic in Iraq. Three sections of this type of highway have been selected along Al-Mishkhab city as a case study. The data collected include flow, headway, number passing and speed. A speed gun was used to measured speed in the selected sections. The passing frequency was high and amounted to about 240passings/hr. Further, the speed distribution was normal. The results of this study indicate that the number of passing vehicles is up to 240 passes/hr/km at 1200 veh/hr. In addition, as flow increases more than 1200 veh/hr, the number of passing vehicles decreases because of absence the adequate gap for such passing.