Calculation Method of Green Time for Pre-timed Signal Control at Isolated Intersection under Random Condition
Huimin Niu · Journal of Highway and Transportation Research and Development · 2010
By analyzing the stochastic characteristics of traffic flow at intersection,a green time optimization model for pre-timed signal at isolated intersection,which uses the expected queue length as its optimization objective,was established.In the process of solving,the analytical algorithm for solving the model was presented by the Lagrange multiplier method on the basis of the stochastic function which was approached by the random simulation.By using this method,the optimal value of the phase green time of the intersection was obtained.At last,a simulation example of a two-phase signalized intersection was presented.The result shows that the random variation of arrival rate has an obvious effect on allocating the green time,which illustrates the correctness of the model and the algorithm.