. . . . "316.221???Taillamps.??? (1)???Every motor vehicle, trailer, semitrailer, and pole trailer, and any other vehicle which is being drawn at the end of a combination of vehicles, shall be equipped with at least two taillamps mounted on the rear, which, when lighted as required in s. 316.217, shall emit a red light plainly visible from a distance of 1,000 feet to the rear, except that passenger cars an" .