Preface

Although great achievements have been made in the construction of highway network in China, with the development of regional economy, traffic problems are becoming more and more serious. The main reason is that the layout of highway network is unreasonable, which is difficult to meet the demand of traffic demand growth. There are many problems in the road network of small and medium-sized cities, such as low technical level and poor service level. Therefore, the construction of highway network has become an important problem in the field of infrastructure construction in various large and medium-sized cities, and how to build roads scientifically and reasonably to form road network has become an urgent problem to be solved in large and medium-sized cities.

Transportation industry is the link of production, distribution, exchange and consumption. One of the basic conditions for developing production, developing market and promoting consumption is to have circulation conditions. With the expansion and improvement of production and economic scale, its circulation conditions must be correspondingly advanced and developed in advance, which is also the general law of market economy. Marx once pointed out that in addition to mining, agriculture and industry, there is a fourth physical production sector, that is, transportation, or transportation of goods. Looking at all countries in the world, although the position of road transportation in different countries and regions is different, it is generally in the main position and plays an important role. Since entering the 21st century, with the expansion of highway network scale, the role of highway transportation in transportation is increasingly significant, so the quality of highway network planning will directly affect the development of the entire transportation industry .

前 言

尽管我国公路网建设已取得了巨大的成绩，但随着区域经济的发展，交通问题日趋严重。其主要原因是公路网布局不合理，难以满足交通需求增长的要求。中小城市的道路网普遍存在着公路网技术等级低、服务水平差等问题。因而公路网建设已成为了各个大中城市在基础设施建设领域中的重要问题，随之而来的如何科学合理的建设公路形成路网就成为大中城市迫切要解决的问题。
      交通运输业是联系生产、分配、交换和消费的纽带。发展生产、开发市场、促进消费， 其基本条件之一是要具备流通条件， 并随着生产和经济规模的扩大与提高，其流通条件必须相应地先行一步和超前发展，这也是市场经济的普遍规律。马克思曾指出:“除了开采业、农业和工业，尚有第四个物质生产部门，那就是运输业，或是运输人，或是运输商品”。综观世界各国，公路运输虽然在不同国家和地区的各种运输方式中所占位置有所不同，但普遍都处于主要地位，发挥着重要的作用。进入 21 世纪以来，随着公路网规模的扩大，公路运输在交通运输的作用日益显著，因此公路网规划的好坏将直接影响着整个交通运输业的发展。