Control model of bus priority at signal intersection considering green loss equilibrium

Xinghua Hu, Xiaoning Zhu, Bing Long

COMPUTER MODELLING & NEW TECHNOLOGIES 2013 17(5C) 132-139

School of Traffic and Transportation Beijing Jiaotong University, Beijing City, China, 10044

To equalize the side effect that caused by the delay due to bus priority at intersections, three methods for green loss equilibrium to achieve bus priority were studied, including green extension, red truncation and phase insertion. Based on the assumption that vehicles arrives linearly, delay analysis were made at single priority request of non-saturated intersection when equilibrium is lost. Computing formula of intersection delay was presented with consideration of green light time non-priority phase loss and make-up during green light time. A timing optimization model was established which is known as normal traffic at rest phases, while objects to a function that maximize average delay at intersection. Based on Frank-Wolfe algorithm, solution came out under the diagonalized design. Instance analysis indicates the timing optimization model effectively balanced green loss at phases of non-priority, while deduced the amount of delaying at intersections. New delay calculation more explicitly described the delay change at intersections of bus priority.