About the Registry
The Federal Motor Carrier Safety Administration (FMCSA) Hazardous Materials (HM) Routing Web site is temporarily down. The HM routing information can be found at the following links below. If there are questions or more information needed, please contact the FMCSA's Hazardous Materials Division at 202-366-6121.
Current List of Designated, Preferred and Restricted Routes (updated as of 2008)
Notice: Transportation of Hazardous Materials; Designated, Preferred, and Restricted Routes [December 4, 2000 Federal Register]
For specific questions concerning the Highway Routing Designations in a state, please contact the FMCSA field office in that state.