No passenger car or autocycle registered in the Commonwealth and manufactured for the year 1963 or for subsequent years shall be operated on the highways in the Commonwealth unless the front seats thereof are equipped with adult safety lap belts or a combination of lap belts and shoulder harnesses of types approved by the Superintendent. Failure to use the safety lap belts or a combination of lap belts and shoulder harnesses after installation shall not be deemed to be negligence. Nor shall evidence of such nonuse of such devices be considered in mitigation of damages of whatever nature. No motor vehicle registered in the Commonwealth and manufactured after January 1, 1968, shall be issued a safety inspection approval sticker if any lap belt, combination of lap belt and shoulder harness, or passive belt systems required to be installed at the time of manufacture by the federal Department of Transportation have been either removed from the motor vehicle or rendered inoperable. No autocycle registered in the Commonwealth shall be issued a safety inspection sticker if any lap belt, combination of lap belt and shoulder harness, or passive belt systems required to be installed under this section have been either removed from the autocycle or rendered inoperable. No passenger car, except convertibles, registered in the Commonwealth and manufactured on or after September 1, 1990, shall be operated on the highways in the Commonwealth unless the forward-facing rear outboard seats thereof are equipped with rear seat lap/shoulder belts of types required to be installed at the time of manufacture by the federal Department of Transportation. No passenger car, including convertibles, registered in the Commonwealth and manufactured on or after September 1, 1991, shall be operated on the highways in the Commonwealth unless the forward-facing rear outboard seats thereof are equipped with rear seat lap/shoulder belts of types required to be installed at the time of manufacture by the federal Department of Transportation. No truck, multi-purpose vehicle, or bus, except school buses and motor homes, with a gross vehicle weight rating of 10,000 pounds or less, registered in the Commonwealth and manufactured on or after September 1, 1991, shall be operated on the highways in the Commonwealth unless the forward-facing rear outboard seats thereof are equipped with rear seat lap/shoulder belts of types required to be installed at the time of manufacture by the federal Department of Transportation. Passenger cars, trucks, multipurpose vehicles, and buses, except school buses and motor homes, registered in the Commonwealth and manufactured on or after September 1, 1992, shall not be operated on the highways of the Commonwealth unless equipped with rear seat lap/shoulder belts of types required to be installed at the time of manufacture by the federal Department of Transportation for each forward-facing rear outboard seating position on a readily removable seat. For the purposes of this section, forward-facing rear outboard seats are defined as those designated seating positions for passengers in outside front facing seats behind the driver and front passenger seats, except any designated seating position adjacent to a walkway that is located between the seat and the near side of the vehicle and is designed to allow access to a more rearward seating position. The Superintendent of State Police shall include in the Official Motor Vehicle Inspection Regulations a section which identifies each classification of motor vehicle required to be equipped with any of the devices described in the foregoing provisions of this section. Such regulations shall also include a listing of the exact devices which are required to be installed in each motor vehicle classification and the model year of each motor vehicle classification on which the standards of the federal Department of Transportation first became applicable.