FMCSA operating authority is often identified as an "MC," "FF," or "MX" number, depending on the type of authority that is granted. To apply for motor carrier operating authority, you'll need to fill out form OP-1 and show proof of adequate insurance coverage.Apply for your trucking authority. You must indicate on the Tow Authorization form where you want the vehicle towed. It's the letter from FMCSA with the date your authority went active and what authority was granted. An Operating Authority Letter includes a company's name, address, USDOT Number, and MC number. This letter is necessary for booking loads. A notice of claim must be filed in writing. Students that are current recipients of Title IV financial aid assistance will need to complete a Student Federal Authorization Form. Surplus revenues from our tolls help support MTA public transit services.