2 red lamps on the back of the load which can be seen from at least 500 feet to the rear.
2 red reflectors on the rear that can be seen from 100 and 600 feet when directly in front of low-beam headlights to show the full width of the load.
2 red lamps, one on each side of the load, which can be seen from at least 500 feet placed near the end of the projecting load to show maximum overhang of the load.