roadingn.公路建设与保养roadn.路；道路；途径；方法road cross-section道路横断面road freight service沿途另担业务road noise reduction路面降噪roadbed construetion路基施工road traffic control道路交通控制road simulation test道路模拟试验road of factory area厂区道路road soft foundation公路软基Road in tourism zone风景旅游区道路road freight traffic公路货运量