§393.17 Lamps and reflectors – combinations in driveaway-towaway operation.
A combination of motor vehicles engaged in driveaway towaway operation must be equipped
with operative lamps and reflectors conforming to the rules in this section.
(a) The towing vehicle must be equipped as
follows:
(a)(1) On the front, there must be at least
two headlamps, an equal number at each side, two turn signals, one at each
side, and two clearance lamps, one at each side.
(a)(2) On each side, there must be at least
one side marker lamp, located near the front of the vehicle.
(a)(3) On the rear, there must be at least
two tail lamps, one at each side, and two stop lamps, one at each side.
(b) Except as provided in paragraph (c) of this section,
the rearmost towed vehicle of the combination (including the towed vehicle or a
tow bar combination, the towed vehicle of a single saddle mount combination,
and the rearmost towed vehicle of a double or triple saddle mount combination)
or, in the case of a vehicle full mounted on a saddle mount vehicle, either the
full mounted vehicle or the rearmost saddle mounted vehicle must be equipped as
follows:
(b)(1) On each side, there must be at least
one side marker lamp, located near the rear of the vehicle.
(b)(2) On the rear, there must be at least
two tail lamps, two stop lamps, two turn signals, two clearance lamps, and two
reflectors, one of each type at each side. In addition, if any vehicle in the
combination is 80 inches or more in overall width, there must be three
identification lamps on the rear.
(c) If the towed vehicle in a combination is a
mobile structure trailer, it must be equipped in accordance with the following
lighting devices. For the purposes of this part, "mobile structure
trailer" means a trailer that has a roof and walls, is at least 10 feet
wide, and can be used off road for dwelling or commercial purposes.
(c)(1) When the vehicle is operated in
accordance with the terms of a special permit prohibiting operation during the
times when lighted lamps are required under §392.30, it must have on the
rear —
(c)(1)(i) Two stop lamps, one on each side
of the vertical centerline, at the same height, and as far apart as practicable;
(c)(1)(ii) Two tail lamps, one on each
side of the vertical centerline, at the same height, and as far apart as
practicable;
(c)(1)(iii) Two red reflex reflectors,
one on each side of the vertical centerline, at the same height, and as far
apart as practicable; and
(c)(1)(iv) Two
turn signal lamps, one on each side of the vertical centerline, at the same
height, and as far apart as practicable.
(c)(2) At all other times, the vehicle must
be equipped as specified in paragraph (b) of this section.
(d) An intermediate towed vehicle in a combination
consisting of more than two vehicles (including the first saddle mounted
vehicle of a double saddle mount combination and the first and second saddle
mount vehicles of a triple saddle mount combination) must have one side marker
lamp on each side, located near the rear of the vehicle.(Tow bar
diagram to illustrate §393.17.)
FIGURE 19. –
Single-Saddle-Mount Diagram to Illustrate §393.17
[40 FR 36126, Aug. 19, 1975, as amended at 47 FR 47837, Oct. 28, 1982; 70 FR 48044, Aug. 15, 2005]