交通运输部门是道路交通管理的主管部门,警察部门是道路交通管理的参与协作部门。美国的道路交通安全管理体制特点则是:虽然针对客观需求,围绕交通安全而构建的组织机构多,但职责不乱,协调不乱,执行不乱。美国在国家一级设有交通部,各州有交通厅(以及车辆管理局),各市县设有交通局。交通部门的主要职责是:运输基础设施规划、产业政策、市场准入、运输行业管理、公路设施管理、交通安 The transportation department is the competent department of road traffic management and the police department is the participating collaborative department of road traffic management. The characteristics of the road traffic safety management system in the United States are as follows: Although there are many organizations built around traffic safety based on objective needs, their duties are not chaos, coordination is not chaos and implementation is chaos. The United States has a Ministry of Transport at the national level, the State has a Communications Department (and the Vehicle Administration), and cities and counties with Transport Bureau. The main duties of the transport sector are: transport infrastructure planning, industrial policy, market access, transport industry management, highway facilities management, traffic safety