To amend the definition of commercial motor vehicle in section 31101 of title 49, United States Code, to exclude certain farm vehicles, and for other purposes.

[AI summary unavailable — showing source text] Revises the definition of "commercial motor vehicle" with respect to federal commercial motor vehicle safety laws to include a vehicle with farm-designated license plates engaged in the transportation of agricultural commodities or farm supplies, or a vehicle controlled by a farmer and used to transport such items to or from a farm, having a gross vehicle weight rating or gross vehicle weight the greater of which exceeds the minimum weight of a commercial motor vehicle as established by the state. (Current law applies to vehicles having a gross vehicle weight rating or gross vehicle weight of at least 10,001 pounds, whichever is greater.) Prohibits the Secretary of Transportation from withholding commercial motor vehicle safety improvement grants from a state solely because it authorizes drivers of farm vehicles having a gross vehicle weight of between 10,000 and 26,001 pounds to operate without complying with federal commercial motor vehicle safety laws.…