公路隧道和桥梁一样是公路上的重要建筑物。它对于改善公路的技术标准,提高运输效率和节约能源等都具有重要的意义。建国初期,我国公路隧道几乎是空白,三十多年来随着公路交通事业的发展,修建了不少隧道。目前,全国已有公路隧道200多座,北京有15座(不包括单车道隧道)。现在我国的公路建设还很落后,为适应四化 Road tunnels and bridges are important buildings on the road. It is of great significance for improving the technical standards of the highway, improving transportation efficiency and saving energy. In the early days of the founding of New China, the road tunnels in our country were almost empty. Over the past 30 years, many tunnels were constructed with the development of highway transportation. At present, there are over 200 road tunnels in China and 15 in Beijing (excluding single-lane tunnels). Now our country’s road construction is still backward, in order to adapt to the four modernizations