Abstract
Though the OD traffic flow is the traffic flow from one zone to another zone, the current traffic assignment methods assume that the OD traffic flow is generated from one node and destined to one node known as centroid. The shape and the constitution of zone are not taken into consideration at all in the assignment methods. In this paper, the errors caused by this assumption will be analyzed. Two traffic assignment methods will be developed to improve the current methods. In the improved methods, OD traffic flow can be generated from many or all nodes in any zone, but the needed data, computation and memory space are the same as that of general traffic assignment methods. The fitness of the improved methods will be certified by the traffic assignment of a assumed network and the road network of Nagoya city.
