Author:
Al-Zerjawi Ahlam K.,Al-Jameel Hamid A.,Zagroot Sajad A.
Abstract
Abstract
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.
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