一、概述公路网的形成和发展取决于社会和区域经济的发展对公路交通的需求，随着国民经济的迅速发展，自然、旅游等国土资源的开发利用，交通事业随之不断发展，公路网的规模也应作相应调整和完善。但对公路网完善与否的评价，只是一个相对的概念，这给衡量公路网的完善程度造 I. Overview The formation and development of the road network depend on the demand of the highway and transportation for the development of the society and the regional economy. With the rapid development of the national economy and the development and utilization of the natural resources and tourism and other land and natural resources, the transportation industry has been continuously developed. The size should also be adjusted and improved accordingly. However, the evaluation of the improvement of the road network is only a relative concept, which gives a measure of how perfect the road network is