A Variable-Bandwidth Approach to Arterial Traffic Signal Optimization with Priority of Straight and Left-Turn Trams

This paper proposes a variable-bandwidth approach to the arterial traffic signal optimization with priority of straight and left-turn trams based on MULTIBAND. First, the basic constraints for green waves of the trams and the general traffic are analyzed. The vital work is the establishment of constraints for the critical parameters at intersections when trams go straight and turn left. Second, according to difference of the traffic flow on each directional road section, the weight coefficients of bandwidth on each link of the arterial can be defined to general traffic bandwidth for general traffic. The maximum and minimum values of some decision variables are established to meet the demands of tram systems and general traffic. Then, mixed-integer nonlinear programming is employed for the optimization. Finally, a case study is presented to indicate that this approach can meet the demands of trams, while improving general traffic significantly.