New Changes to the National Hazardous Materials Route Registry

FMCSA Updates Routes for Hazardous Materials in New Registry Notice

The Federal Motor Carrier Safety Administration has issued new updates to the National Hazardous Materials Route Registry. The update includes changes that states and Tribal governments reported between April 1, 2024, and March 31, 2025. The registry lists all approved, preferred, and restricted routes for hazardous materials (hazmat) shipments.

What the Updates Mean for Hazmat Carriers

The registry helps carriers understand where they can move hazmat. It includes routes for Class 7 radioactive materials and for non-radioactive hazardous loads. States choose which roads are used, restricted, or preferred. FMCSA then publishes those choices in the national registry.

This information is important for planning trips. Routing rules can affect miles, costs, and compliance checks. Drivers who move hazardous materials must follow these rules to avoid violations.

Key Updates to Hazmat Routes

The latest changes include updates in Washington, D.C., Michigan, and California. These updates may affect daily and long-haul movements of hazmat.

Washington, D.C.

A new designated route for hazmat is now listed.

• I-295 from Oxon Run Creek to I-695 is added as a route for all non-radioactive hazardous materials.
  This gives carriers a clearer path through the southeast part of the city.

Michigan

Michigan changed its rules for the Ambassador Bridge.

• The bridge between Detroit and Windsor now restricts Class 1 explosives, Class 6.2 infectious substances, and Class 7 radioactive materials.
  Carriers hauling these types of hazmat will need another crossing.

California

California added two new preferred routes for Class 7 radioactive materials.

• State Route 58 from Interstate 15 to State Route 223
• State Route 223 from State Route 58 to Interstate 5
  Both routes give drivers a more direct and safer option for these higher-risk hazmat shipments.

Why These Hazardous Materials Changes Matter

Even small route changes can affect daily operations. A new restriction may force a detour. A new preferred route may help improve both safety and efficiency. Because hazmat has strict rules, carriers depend on a current and complete registry.

FMCSA notes that it is not creating new rules. It is updating the registry based on information from state and Tribal governments. This helps ensure that routing for hazmat stays accurate for carriers.

Where to Find the Full Hazardous Materials Route Registry

FMCSA hosts the complete and updated National Hazardous Materials Route Registry on its website. The changes listed in this notice take effect on December 8, 2025. Carriers and safety managers can review the full list to stay compliant with hazmat routing rules.