关键词: 公路网, 功能结构, 组合归并法, 自相似

Abstract: Most highway network shave not been classified from the viewpoint of its function. The paper divides the knots into five levels according to its functions based on the self-similarity of transportation networks. The stability of knots determines the stability of the network. The method of combination merges is used to get the demarcation standard of the classes of highway function. The functions are classified into two levels as stated in the paper. The mileage of the main highway on national level of our country is obtained by the diagram method. The paper also gathers the total mileage of highway, the specific weight construction of the circuit of each function class and the circuit of the main function class in the east and west region. With the analytical parameter of a, the difference between the east and the west regions is discussed and the meaning of this kind of difference is also pointed out. Making use of the relation among the main highway, the highway and freeway, the paper finally concludes the total mileage of the freeway required for national economic development.

Key words: highway network, function and construction, combined merger, self-similarity