解放以前,全国仪有十几座公路隧道,最长的不超过200m,大部分为单车道,断面狭小,无衬砌。建国以来,随着交通事业的发展,各地新建了许多隧道。据《公路隧道设计规范》编写组1987年底—1988年底的调查资料统计,目前全国公路隧道近400座(包括设计、住建隧道),总长度约80公里。 Before the liberation, there were over a dozen highway tunnels in the country, with the longest no more than 200m, most of them being single-lane roads with narrow sections and no lining. Since the founding of the People’s Republic of China, many new tunnels have been built around the country with the development of transportation. According to the survey data of the compilation team of “Highway Tunnel Design Code” from the end of 1987 to the end of 1988, there are nearly 400 highway tunnels in the country (including design and residential tunnels) with a total length of about 80 km.