National Highway System (NHS)

Information on the National Highway System (NHS) and the Federal-Aid Highway System can be found here: https://www.michigan.gov/mdot/Programs/highway-programs/nfc National Highway System (NHS) - FHWA states the NHS consists of roadways important to the nation's economy, defense, and mobility. The National Highway System (NHS) includes the following subsystems of roadways (note that a specific highway route may be on more than one subsystem): Interstate: The Eisenhower Interstate System of highways retains its separate identity within the NHS. Other Principal Arterials: These are highways in rural and urban areas which provide access between an arterial and a major port, airport, public transportation facility, or other intermodal transportation facility. Strategic Highway Network (STRAHNET): This is a network of highways which are important to the United States' strategic defense policy and which provide defense access, continuity and emergency capabilities for defense purposes. Major Strategic Highway Network Connectors: These are highways which provide access between major military installations and highways which are part of the Strategic Highway Network. Intermodal Connectors: These highways provide access between major intermodal facilities and the other four subsystems making up the National Highway System.可通过以下链接获取美国国家公路系统（National Highway System, NHS）及联邦援助公路系统（Federal-Aid Highway System）的相关信息：https://www.michigan.gov/mdot/Programs/highway-programs/nfc 美国联邦公路管理局（Federal Highway Administration, FHWA）指出，美国国家公路系统由对国家经济、国防及交通出行至关重要的公路构成。美国国家公路系统包含以下公路子系统（注：某条特定公路可能同时隶属于多个子系统）： 1. 州际公路系统：艾森豪威尔州际公路系统在美国国家公路系统中保持独立的系统属性； 2. 其他主要干线公路：指分布于乡村及城市区域，用于衔接干线公路与主要港口、机场、公共交通枢纽或其他多式联运交通设施的公路； 3. 战略公路网络（Strategic Highway Network, STRAHNET）：指服务于美国国防战略政策，可为国防行动提供通行保障、运行连续性支持及应急处置能力的公路网络； 4. 战略公路网络主要连接线：指用于连接主要军事设施与隶属于战略公路网络的公路的干线公路； 5. 多式联运连接线：指用于衔接主要多式联运设施与构成美国国家公路系统的其他四个子系统的公路。