2011
HMS 2011 Proceeding
Efficiency of Triple Left-Turn Lanes at Signalized Intersections
Authors: Khaled Shaaban
Abstract
Left-turn maneuvers can cause major delays to other traffic, and require specific analysis, design consideration, and traffic control to avoid operational and safety problems. As traffic congestion and travel demands continue to grow, alternatives such as triple left-turn lanes need to be considered. When installing a triple left-turn lane at an intersection, vehicles make their left turn movement from three separate left turn lanes. The purpose of this paper was to estimate any improvement in the efficiency of signalized intersections due to the addition of the triple left-turn lane compared to a dual left-turn lane under different scenarios using micro-simulation. A linear regression model was created to help practitioners to estimate the percentage of delay reduction expected when adding a triple left-turn. This information will be useful to improve the decision-making process of using triple left-turn lanes as an alternative solution to the traffic congestion problem.
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