Large truck operations are governed by the Federal Motor Carrier Safety Regulations and largely identical state trucking safety rules. Sometimes people are surprised that these safety rules no not apply to tractor trailers only. Under 49 CFR 390.5, a commercial motor vehicle is defined to include any self-propelled or towed motor vehicle used on a highway in interstate commerce to transport passengers or property when the vehicle –
a. Has a gross vehicle weight rating or gross combination weight rating, or gross vehicle weight or gross combination weight 10,001 pounds or more, whichever is greater; or
b. Is designed or used to transport more than 8 passengers (including the driver) for compensation; or
c. Is designed or used to transport more than 15 passengers, including the driver, and is not used to transport passengers for compensation; or
d. Is used in transporting material found by the Secretary of Transportation to be hazardous.
Every state has adopted most portions of the Federal Motor Carrier Safety Regulations for intrastate transportation.
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