Amends GS 20-129 to prohibit selling or operating a vehicle, or any motorcycle or motor-driven cycle, manufactured after December 31, 1970, unless it has a stop lamp on each side of the rear of the vehicle. Requires the lamps to emit, reflect, or display a red or amber light visible from no less than 100 feet to the rear, and requires it to be actuated by foot brake. Makes conforming changes to GS 20-129.1 (additional lighting equipment required on certain vehicles).