Abstract
A protected left turn phase is often used at intersections with heavy left turns. This may induce a capacity gap between adjacent intersections along the arterial road among which only parts of intersection are with protected left turn phase. A model for integrated optimization of protected left turn phases for adjacent intersections along the arterial road is developed to solve this problem. Two objectives are considered: capacity gap minimization and capacity maximization. The problems are formulated as Binary-Integer-Linear-Programs, which are solvable by standard branch-and-bound routine. A set of constraints have been set up to ensure the feasibility of the resulting optimal left turn phase type and signal settings. A field intersections group of the Wei-er Road of Ji’nan city is used to test the proposed model. The results show that the method can decrease the capacity gap between adjacent intersections, reduce the delay as well as increase the capacity in comparison with the field signal plan and signal plan optimized by Synchro. The sensitivity analysis has further demonstrated the potential of the proposed approach to be applied in coordinated design of left turn phases between adjacent intersections along the arterial road under different traffic demandpatterns.
Highlights
A protected left turn phase is often used at intersections with heavy left turns
This may induce a capacity gap between adjacent intersections along the arterial road among which only parts of intersection are with protected left turn phase
The results show that the method can decrease the capacity gap between adjacent intersections, reduce the delay as well as increase the capacity in comparison with the field signal plan and signal plan optimized by Synchro
Summary
A protected left turn phase is often used at intersections with heavy left turns. This may induce a capacity gap between adjacent intersections along the arterial road among which only parts of intersection are with protected left turn phase. Both left turn forbidden and protected left turn phase may induce a redistribution of traffic flow as well as changes in capacity and capacity gap between adjacent intersections along the arterial road Despite their significant contribution in left turn signal operations, most of the literatures and guidelines have focused on the optimization of appropriate left turn signal control mode for an isolated signalized intersection only based on left turn traffic demand of the target isolated intersection [15,16,17,18,19,20,21]. Numerical examples are shown at the end to demonstrate the effectiveness of the proposed method
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