摘要
The rapid development of the automobile industry and the relative lag of the road construction have constituted a prominent contradiction all over the world, particularly, in most of large cities. To cope with it, elevated roads have been built in many cities both at home and abroad. However, traffic jams frequently appear on elevated roads immediately after the completion of their construction. The awkward situation mainly results from the planning bug or the unsuitable control, apart from drastic increase in transportation demand. Elevated roads,
The rapid development of the automobile industry and the relative lag of the road construction have constituted a prominent contradiction all over the world, particularly, in most of large cities. To cope with it, elevated roads have been built in many cities both at home and abroad. However, traffic jams frequently appear on elevated roads immediately after the completion of their construction. The awkward situation mainly results from the planning bug or the unsuitable control, apart from drastic increase in transportation demand. Elevated roads, ramps and ground roads are closely interconnected in three-dimensional urban traffic networks. Based on the field measurements, in this dissertation, by using the macroscopic and microscopic methods, i.e., the hydrodynamic models and cellular automaton models for traffic flows, the relations among the three interacting parts were investigated. The mathematical modeling and numerical simulation were conducted for the sections of elevated roads and for the interaction of elevated roads and intersections on the ground. After having analyzed the complicated dynamic behavior on the elevated roads, some suggestions were put forward for the transportation planning and management. The contents of the dissertation are as follows:
