National Hazardous Materials Route Registry

For maps and a list of Highway Routing Designations for individual States go to:

National Hazardous Materials Route Registry by State

Federal Register Notices

061721 National Hazardous Materials Route Registry Notice

The above Notice is the June 17, 2021 Federal Register publication of the latest updates to the list of Designated, Preferred and Restricted Routes.

060320 National Hazardous Materials Route Registry Notice

The above Notice is the June 3, 2020 Federal Register publication of the latest updates to the list of Designated, Preferred and Restricted Routes.

092419 National Hazardous Materials Route Registry Notice

The above Notice is the September 24, 2019 Federal Register publication of the latest updates to the list of Designated, Preferred and Restricted Routes.

080918 National Hazardous Materials Route Registry Notice

The above Notice is the August 9, 2018 Federal Register publication of the latest updates to the list of Designated, Preferred and Restricted Routes.

080816 National Hazardous Materials Route Registry Revisions and Procedures

The above Notice is the August 8, 2016 Federal Register publication of updates to the list of Designated, Preferred and Restricted Routes as well as procedures for Routing Agencies to update their Highway Routing Designations.

042915 National Hazardous Materials Route Registry Notice

The above Notice is the April 29, 2015 Federal Register publication of the full National list of Designated, Preferred and Restricted Routes.

About the Registry

For specific questions concerning the Highway Routing Designations in a state, please contact the FMCSA field office in that state.