Aiming at the disadvantage of the parking twice in the existing setting mode, the starting characteristic of the first left-turn vehicle is studied, and the optimization model of signal timing in the left-turn waiting zone is established, to optimize the existing signal timing scheme, reduce or avoid the second stop, and enable the vehicle to pass through the intersection more continuous and with less stopping. The traffic simulation software was used for verification and analysis. By comparison before and after signal timing optimization, CO, NOX, VOC, and other emissions and fuel consumption values, as well as parking times were respectively reduced by 7.37%, 9.84%, 8.86%, 11.29%, and 13.78%. It is proved that the optimization model of left-turn waiting zone signal timing can effectively reduce the second stop of vehicles in the waiting zone and reduce the exhaust emission at intersections.

CICTP