Study on estimation of dynamic origin-destination flows in freeway corridors

Dynamic O-D flows between entry and exit are important input data of freeway management systems, and are difficult to get. This paper reviewed the evolution process of dynamic O-D flows estimation, put forward integrated and simplified calculation methods of dynamic route travel time, and set up a model of dynamic O-D flows estimation for freeway corridors. 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 O-D flows between entry and exit of freeway corridors. Data experiments and practical application show that the model and algorithm are efficient and accurate, and can be applied in on-line systems.