Section 347.16 - Clearance lamps and reflectors(1) No person shall operate on a highway during hours of darkness any vehicle, except automobiles, having a width at any part in excess of 80 inches unless such vehicle is equipped with: (a) Two clearance lamps mounted on the front of the vehicle so as to be visible from the front; and(b) Two clearance lamps mounted on the rear of the vehicle so as to be visible from the rear; and(c) Two reflectors mounted on the rear of the vehicle in such a manner as to indicate as nearly as possible the extreme width of the vehicle.(2) No person shall operate any of the following vehicles on a highway during hours of darkness unless such vehicles are equipped as indicated: (a) Every truck tractor shall carry on the front 2 clearance lamps, one at each side.(b) Every trailer or semitrailer shall carry on the rear 2 reflectors, one on each side.(3) Reflectorized material extending across the full width of the vehicle and otherwise meeting the mounting and visibility specifications for reflectors may be used in lieu of the reflectors required by this section.