National Highway System (NHS)

The National Highway System (NHS) dataset and its geometries was updated on August 08, 2025 from the Federal Highway Administration (FHWA) and is part of the U.S. Department of Transportation (USDOT)/Bureau of Transportation Statistics (BTS) National Transportation Atlas Database (NTAD). The National Highway System consists of roadways important to the nation's economy, defense, and mobility. The National Highway System (NHS) includes the following subsystems of roadways: Interstate - The Eisenhower Interstate System of highways, Other Principal Arterials - 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) - 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 - highways which provide access between major military installations and highways which are part of the Strategic Highway Network, Intermodal Connectors - highways providing access between major intermodal facilities and the other four subsystems making up the National Highway System. A specific highway route may be on more than one subsystem. A data dictionary, or other source of attribute information, is accessible at https://doi.org/10.21949/1529838国家公路系统（National Highway System, NHS）数据集及其空间几何数据于2025年8月8日由美国联邦公路管理局（Federal Highway Administration, FHWA）完成更新，该数据集隶属于美国运输部（U.S. Department of Transportation, USDOT）/美国运输统计局（Bureau of Transportation Statistics, BTS）的国家交通地图集数据库（National Transportation Atlas Database, NTAD）。国家公路系统涵盖对国家经济、国防及交通通行至关重要的公路路网。国家公路系统（NHS）包含以下公路子系统：州际公路系统——艾森豪威尔州际公路系统；其他主要干线公路——指在城乡地区连接干线公路与主要港口、机场、公共交通设施或其他多式联运枢纽的公路；战略公路网（Strategic Highway Network, STRAHNET）——服务于美国战略国防政策，为国防行动提供通行保障、线路连续性及应急能力的公路网络；战略公路网主要连接通道——指连接大型军事设施与战略公路网的公路；多式联运连接通道——指连接大型多式联运枢纽与国家公路系统其余四个子系统的公路。单条公路线路可同时归属多个子系统。可通过https://doi.org/10.21949/1529838获取数据字典或其他属性信息源。