Abstract: In this paper, a probability detour path choice model and a traffic state updating model were established, considering the influence of traffic guidance information on car drivers' route choice at intersection. These models were considered as two important constraints. Then, an optimal signal timing model was built under the coordination control of traffic guidance and bus priority. An improved genetic algorithm was applied to solve the optimization model. Results show that the total passenger delay, vehicle delay and the exhaust emissions per capita are reduced by 4.1%, 2.8% and 1.4% respectively after considering the influence of traffic guidance information. It is certified that the goals to reduce the overall traffic network load and vehicle exhaust can be achieved to certain extent by reasonable traffic guidance.

Key words: engineering of communications and transportation systems, traffic guidance, bus priority, exhaust emissions, signal timing, improved genetic algorithm