Study on Estimation of Dynamic Origin-Destination Flows in Expressway Corridors

Dynamic OD flow between entry and exit are important input data of expressway management system,and are difficult to get.This paper reviewed the evolution of dynamic OD flow estimation,put forward integrated and simplified calculation methods of dynamic route travel time,and set up a model of dynamic OD flow estimation for expressway section.The paper also designed a genetic algorithm to solve the problem,discussed six key issues of the algorithm,and provided an effective method to obtain the dynamic OD flow between entry and exit of expressway section.Experimental results show that the model and algorithm are efficient and accurate,and can be applied in on-line systems.