SECTION 1.  Section 1 of chapter 90 of the General Laws, as appearing in the 2010 Official Edition, is hereby amended, by inserting after the definition of "Bus or Motorbus," the following definition:

"Commercial Motor Vehicle," shall mean any motor vehicle which is not a private passenger motor vehicle, antique motor car, motorcycle, auto home, house trailer, taxicab, ambulance, hearse, livery vehicle, or school pupil transport vehicle. A commercial motor vehicle shall include the following vehicles:

(a) The vehicle has a gross vehicle weight rating or gross combination weight rating of 10,001 or more pounds; or

(b) The vehicle is designed to transport more than 15 passengers, including the driver; or

(c) The vehicle is used in the transportation of hazardous materials in a quantity requiring placarding in accordance with the Hazardous Materials Regulations of the United States Department of Transportation. Any commercial motor vehicle that singularly has a gross vehicle weight rating of 10,001 pounds or less and is designed to meet emissions standards, shall be submitted for an emissions inspection in addition to all applicable safety inspection requirements; or

(d) A single, full or semi-trailer, used in commerce, with a manufacturer's gross vehicle weight rating over 3,000 lbs; or

(e) Any vehicle which has a vehicle weight, or curb weight, of more than six thousand pounds, as per the manufacturer's description of said vehicle, unless such vehicle is a sport utility vehicle or passenger van, or a pickup truck or cargo van meeting the definition of private passenger vehicle; or

(f) Any vehicle which has five or more wheels on the ground.

Notwithstanding the aforementioned vehicles, a dual rear wheel pick-up truck registered by an individual other than a business, and not used for commercial purposes, shall not be classified as a commercial vehicle for purposes of registration.