Hazmat Placarding Requirements for CMV Drivers
When hazmat placards are required on CMVs, placard types by hazard class, placement rules, and quantity thresholds under 49 CFR Part 172.
These guides cover the operational compliance requirements for transporting hazardous materials by highway under the Hazardous Materials Regulations (HMR) in 49 CFR Parts 171–180. The H endorsement allows a CDL driver to transport placardable quantities of hazmat — these pages cover what that entails on every trip.
When hazmat placards are required on CMVs, placard types by hazard class, placement rules, and quantity thresholds under 49 CFR Part 172.
Required shipping paper content for hazmat shipments, cab location requirements, and emergency response information under 49 CFR Part 172.
Hazmat loading and segregation rules under 49 CFR Part 177: incompatible materials, prohibited co-loading, and driver responsibilities at loading.
Federal and state route restrictions for hazmat highway transport: tunnel restrictions, preferred NRHM routes, and how to identify applicable restrictions.
When a hazmat security plan is required under 49 CFR Part 172, what the plan must include, and which materials trigger the requirement.
When and how to report hazmat incidents under 49 CFR Part 171: immediate NRC telephone notice and the 30-day written report to PHMSA.
Federal hazmat training requirements: five function areas, the 90-day initial window, 3-year recurrent cycle, and recordkeeping under Part 172 Subpart H.