49 CFR 390.5 definitions in Part 390.5 of the Rules and Regulations Federal Motor Carrier Safety Regulation 390.5 Federal Motor Carrier Safety Regulation 390.5 Federal Motor Carrier Safety Administration Regulation 390.5 "FEDERAL MOTOR CARRIER SAFETY REGULATIONS; GENERAL" CMV 390.5 Federal Motor Carrier Safety Regulation 390.5 Code of Federal Regulations CMV 390.5 commercial motor vehicle (CMV) Federal Motor Carrier Safety Administration Regulation 390.5