National Highway System (NHS)

The Idaho Transportation Department's (ITD) Roads and Highways Road Network Linear Referencing System (LRS) National Highway System (NHS) event polyline feature class that is more specifically referenced as the Dwight D. Eisenhower National System of Interstate and Defense Highways. It consists of routes of highest importance to the nation which connect, as directly as practical, principal metropolitan areas, cities and industrial centers. Additionally, it includes important routes into, through and around urban areas, serving national defense, and to the greatest extent possible, connect at suitable, border points with continental importance into and out of Canada and Mexico. This layer is an export from Roads and Highways that represents only the active records within the LRS. This content item is a sub-layer of the Planning authoritative feature layer. Metadata本数据集为爱达荷州运输部（Idaho Transportation Department，ITD）的道路与公路路网线性参考系统（Linear Referencing System，LRS）下的国家公路系统（National Highway System，NHS）事件折线要素类，其具体对应范畴为德怀特·D·艾森豪威尔州际与国防公路系统。该数据集包含对美国国家至关重要的干线公路，此类线路以尽可能贴合实际的直接路径连接主要都市区、城市及工业中心。此外，其还涵盖通往、穿越及环绕城市区域的重要线路，服务于国家国防需求，并尽最大可能在具备大陆重要性的边境口岸，实现与加拿大、墨西哥的出入境连通。本图层为从道路与公路系统导出的子集，仅代表线性参考系统中的活动记录。本内容项为规划权威要素图层的子图层。元数据