National Highway System

Under MAP-21, the Enhanced NHS is composed of rural and urban roads nationwide serving major population centers, international border crossings, intermodal transportation facilities, and major travel destinations. The NHS includes:The Interstate System. Other Principal arterials and border crossings on those routes (including other urban and rural principal arterial routes, and border crossings on those routes, that were not included on the NHS before the date of enactment of the MAP-21).Intermodal connectors -- highways that provide motor vehicle access between the NHS and major intermodal transportation facilities. STRAHNET -- the network of highways important to U.S. strategic defense. STRAHNET connectors to major military installations.

Data and Resources

Field Value
accessLevel public
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier ae1efe3d-279b-4442-b84e-153baa316c62
issued 2021-11-02T19:24:11.000Z
modified 2022-04-22T20:10:58.000Z
publisher Caltrans
resource-type Dataset
source_datajson_identifier true
source_hash 342e5c4eb46b053d5a4385a7e3fe68eb6952293d
source_schema_version 1.1
theme {Transportation}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • california-department-of-transportation
  • california-state-transportation-agency
  • caltrans
  • caopendata
  • ckan
  • clearinghouse
  • geo
  • geoss
  • highway
  • national
  • north-america
  • system
  • united-states
isopen False
license_id notspecified
license_title License not specified
maintainer California_Department_of_Transportation
maintainer_email caltrans.gislib@dot.ca.gov
metadata_created 2025-11-20T14:35:59.992962
metadata_modified 2025-11-20T14:35:59.992966
notes <div style='text-align:Left;'><div><div><p><span>Under MAP-21, the Enhanced NHS is composed of rural and urban roads nationwide serving major population centers, international border crossings, intermodal transportation facilities, and major travel destinations. The NHS includes:</span></p><p><span /></p><p><span>The Interstate System. </span></p><p><span /></p><p><span>Other Principal arterials and border crossings on those routes (including other urban and rural principal arterial routes, and border crossings on those routes, that were not included on the NHS before the date of enactment of the MAP-21).</span></p><p><span /></p><p><span>Intermodal connectors -- highways that provide motor vehicle access between the NHS and major intermodal transportation facilities. </span></p><p><span /></p><p><span>STRAHNET -- the network of highways important to U.S. strategic defense. </span></p><p><span /></p><p><span>STRAHNET connectors to major military installations.</span></p></div></div></div>
num_resources 6
num_tags 15
title National Highway System