highway bus公路局汽车highwayn.公路；(水陆空)直接航线或路线highway signalized intersections信号平面交叉口highway tunnel structure pattern隧道结构型式highway subgrade drainage system公路路基排水系统highway in seasonal frost region季冻区公路highway geotechnical engineering公路岩土工程highway-railway grade crossing公铁路平交叉highway engineering construction公路工程建设highway maintenance organization公路养护机构highway dynamic weighting system公路动态称重系统highway two-arcade twin tunnel公路双连拱隧道