MCS-150B

Definition

MCS-150B is the combined Motor Carrier Identification Report and Hazardous Materials Safety Permit application filed by carriers who transport certain placardable hazardous materials in interstate commerce. Required under 49 CFR §390.19T alongside the standard MCS-150 filing schedule. The Hazardous Materials Safety Permit application piece (Form MCSA-1) was previously a separate submission but is now integrated into the MCS-150B for hazmat carriers. Permit categories are tied to specific hazardous-materials classifications including radioactive Class 7 highway-route-controlled, certain explosives, methane LNG, and toxic by inhalation. Renewal cycle is biennial like the standard MCS-150.