Simulation study on traffic signal timing optimization integrating environmental factor and delay

An approach for signal timing optimization by an integrated consideration of traffic environment and intersection delay factors was proposed. A signal timing optimization model was established using the Genetic Algorithm (GA) as the optimization tool, in which the decrease of vehicle exhaust emission and mean delay at intersections was adopted as the overall objective, and the signal cycle time and phase green time as the optimized variables. The model was implemented by using microscopic traffic simulation model VISSIM, the programming language MATLAB and Visual Basic 6.0. Finally, the feasibility and validity of the proposed approach was examined by a case study from the real road network.