随着我国国民经济发展,交通运输在国民经济和社会发展中的作用越来越明显,地位越来越高,特别是作为交通运输主动脉的高速公路,得到了迅速发展。十年间,我国高速公路由2002年底的2.51万公里增加到2011年底的8.49万公里,跃居世界第二,8.6万公里国家高速公路网已 With the development of our country’s national economy, transportation plays an increasingly significant role in the national economy and social development. Its status is becoming higher and higher, especially as the expressway for the transportation aorta, which has witnessed rapid development. In the past ten years, the number of highways in our country increased from 25,100 kilometers at the end of 2002 to 84,900 kilometers at the end of 2011, ranking second in the world and the national highway network of 86,000 kilometers