1引言环境保护是我国的一项基本国策。随着我国国民经济的蓬勃发展,公路建设步伐越来越大。近年来,我国公路总里程不断增长,汽车保有量持续增加,公路在国民经济综合运输体系中的位置愈来愈重要。伴随着公路的高速发展,公路污染、公路对周边环境影响等问题也大量凸现出来。 1 Introduction Environmental protection is a basic national policy of our country. With the vigorous development of our national economy, the pace of highway construction is getting bigger and bigger. In recent years, the total mileage of highways in our country has kept growing and the number of cars kept increasing. The position of highways in the national economy integrated transportation system has become increasingly important. Along with the rapid development of highways, many problems such as road pollution and the impact of roads on the surrounding environment have also emerged.