Section

[Code of Federal Regulations]

[Title 49, Volume 5]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR393.11]

[Page 370-386]

TITLE 49--TRANSPORTATION

DEPARTMENT OF TRANSPORTATION

PART 393_PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION--Table of

Contents

Subpart B_Lamps, Reflective Devices, and Electrical Wiring

Sec. 393.11 Lamps and reflective devices.

(a)(1) Lamps and reflex reflectors. Table 1 specifies the

requirements for lamps, reflective devices and associated equipment by

the type of commercial motor vehicle. The diagrams in this section

illustrate the position of the lamps, reflective devices and associated

equipment specified in Table 1. All commercial motor vehicles

manufactured on or after December 25, 1968, must, at a minimum, meet the

applicable requirements of 49 CFR 571.108 (FMVSS No. 108) in effect at

the time of manufacture of the vehicle. Commercial motor vehicles

manufactured before December 25, 1968, must, at a minimum, meet the

requirements of subpart B of part 393 in effect at the time of

manufacture.

(2) Exceptions: Pole trailers and trailer converter dollies must

meet the part 393 requirements for lamps, reflective devices and

electrical equipment in effect at the time of manufacture. Trailers

which are equipped with conspicuity material which meets the

requirements of Sec. 393.11(b) are not required to be equipped with the

reflex reflectors listed in Table 1 if--

(i) The conspicuity material is placed at the locations where reflex

reflectors are required by Table 1; and

(ii) The conspicuity material when installed on the motor vehicle

meets the visibility requirements for the reflex reflectors.

(b) Conspicuity Systems. Each trailer of 2,032 mm (80 inches) or

more overall width, and with a GVWR over 4,536 kg (10,000 pounds),

manufactured on or after December 1, 1993, except pole trailers and

trailers designed exclusively for living or office use, shall be

equipped with either retroreflective sheeting that meets the

requirements of FMVSS No. 108 (S5.7.1), reflex reflectors that meet the

requirements FMVSS No. 108 (S5.7.2), or a combination of retroreflective

sheeting and reflex reflectors that meet the requirements of FMVSS No.

108 (S5.7.3). The conspicuity system shall be installed and located as

specified in FMVSS No. 108 [S5.7.1.4 (for retroreflective sheeting),

S5.7.2.2 (for reflex reflectors), S5.7.3 (for a combination of sheeting

and reflectors)] and have certification and markings as required by

S5.7.1.5 (for retroreflective tape) and S5.7.2.3 (for reflex

reflectors).

commercial motor vehicle may be equipped with an amber stop lamp, a tail

lamp, or other lamp which is optically combined with an amber stop lamp

or tail lamp.

(d) Prohibition on the use of auxiliary lamps that supplement the

identification lamps. No commercial motor vehicle may be equipped with

lamps that are in a horizontal line with the required identification

lamps unless those lamps are required by this regulation.

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Table 1.--Required Lamps and Reflectors on Commercial Motor Vehicles

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Height above

the road

surface in

millimeters

(mm) (with

Item on the vehicle Quantity Color Location Position English units Vehicles for which the devices

in parenthesis) are required

measured from

the center of

the lamp at

curb weight

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Headlamps........................ 2 White.................. Front.......... On the front at Not less than A, B, C

the same 559 mm (22

height, with inches) nor

an equal more than

number at each 1,372 mm (54

side of the inches).

vertical

center line as

far apart as

practicable.

Turn signal (front). See 2 Amber.................. At or near the One on each Not less than A, B, C

footnotes 2 and 12. front. side of the 381 mm (15

vertical inches) nor

centerline at more than

the same 2,108 mm (83

height and as inches).

far apart as

practicable.

Identification lamps (front). See 3 Amber.................. Front.......... As close as All three on B, C

footnote 1. practicable to the same level

the top of the as close as

vehicle, at practicable to

the same the top of the

height, and as motor vehicle.

close as

practicable to

the vertical

centerline of

the vehicle

(or the

vertical

centerline of

the cab where

different from

the centerline

of the

vehicle) with

lamp centers

spaced not

less than 152

mm (6 inches)

or more than

305 mm (12

inches) apart.

Alternatively,

the front

lamps may be

located as

close as

practicable to

the top of the

cab.

Tail lamps. See footnotes 5 and 11. each side of same level

the vertical between 381 mm

centerline at (15 inches)

the same and 1,829 mm

height and as (72 inches).

far apart as

practicable.

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Table 1.--Required Lamps and Reflectors on Commercial Motor Vehicles

--------------------------------------------------------------------------------------------------------------------------------------------------------

Height above

the road

surface in

millimeters

(mm) (with

Item on the vehicle Quantity Color Location Position English units Vehicles for which the devices

in parenthesis) are required

measured from

the center of

the lamp at

curb weight

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Stop lamps. See footnotes 5 and 13. each side of same level

the vertical between 381 mm

centerline at (15 inches)

the same and 1,829 mm

height and as (72 inches).

far apart as

practicable.

Clearance lamps. See footnotes 2 Amber.................. One on each One on each Both on the B, C, D, G, H

8, 9, 10, 15 & 17. side of the side of the same level as

front of the vertical high as

vehicle. centerline to practicable.

indicate

overall width.

2 Red.................... One on each One on each Both on the B, D, G, H

side of the side of the same level as

rear of the vertical high as

vehicle. centerline to practicable.

indicate

overall width.

Reflex reflector, intermediate 2 Amber.................. One on each At or near the Between 381 mm A, B, D, F, G

(side). side. midpoint (15inches) and

between the 1,524 (60

front and rear inches).

side marker

lamps, if the

length of the

vehicle is

more than

9,144 mm (30

feet).

Reflex reflector (rear). See 2 Red.................... Rear........... One on each Both on the A, B, C, D, E, F, G

footnotes 5, 6, and 8. side of the same level,

vertical between 381 mm

centerline, as (15 inches)

far apart as and 1,524 mm

practicable (60 inches).

and at the

same height.

Reflex reflector (rear side)..... 2 Red.................... One on each As far to the Both on the A, B, D, F, G

side (rear). rear as same level,

practicable. between 381 mm

(15 inches)

and 1,524 mm

(60 inches).

Reflex reflector (front side). 2 Amber.................. One on each As far to the Between 381 mm A, B, C, D, F, G

See footnote 16. side (front). front as (15 inches)

practicable. and 1,524 mm

(60 inches).

License plate lamp (rear). See 1 White.................. At rear license No requirements A, B, C, D, F, G

footnote 11. plate to

illuminate the

plate from the

top or sides.

Side marker lamp (front). See 2 Amber.................. One on each As far to the Not less than A, B, C, D, F

footnote 16. side. front as 381 mm (15

practicable. inches).

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Side marker lamp intermediate.... 2 Amber.................. One on each At or near the Not less tan A, B, D, F, G

side. midpoint 381 mm (15

between the inches).

front and rear

side marker

lamps, if the

length of the

vehicle is

more than

9,144 mm (30

feet).

Side marker lamp (rear). See 2 Red.................... One on each As far to the Not less than A, B, D, F, G

footnotes 4 and 8. side. rear as 381 mm (15

practicable. inches), and

on the rear of

trailers not

more than

1,524 mm (60

inches).

Turn signal (rear). See footnotes 2 Amber or red........... Rear........... One lamp on Both on the A, B, C, D, E, F, G

5 and 12. each side of same level,

the vertical between 381 mm

centerline as (15 inches)

far apart as and 2,108 mm

practicable. (83 inches).

Identification lamp (rear). See 3 Red.................... Rear........... One as close as All three on B, D, G

footnotes 3, 7, and 15. practicable to the same level

the vertical as close as

centerline. practicable to

One on each the top of the

side with lamp vehicle.

centers spaced

not less than

152 mm (6

inches) or

more than 305

mm (12 inches)

apart.

Vehicular hazard warning signal 2 Amber.................. Front.......... One lamp on Both on the A, B, C

flasher lamps. See footnotes each side of same level,

5 and 12. the vertical between 381 mm

centerline, as (15 inches)

far apart as and 2,108 mm

practicable. (83 inches).

2 Amber or red........... Rear........... One lamp on Both on the A, B, C, D, E, F, G

each side of same level,

the vertical between 381 mm

centerline, as (15 inches)

far apart as and 2,108 mm

practicable. (83 inches).

Backup lamp. See footnote 14.

Parking lamp..................... 2 Amber or white......... Front.......... One lamp on Both on the A

each side of same level,

the vertical between 381 mm

centerline, as (15 inches)

far apart as and 2,108 mm

practicable. (83 inches).

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Legend: Types of commercial motor vehicles shown in the last column of Table 1.

A. Buses and trucks less than 2,032 mm (80 inches) in overall width.

B. Buses and trucks 2,032 mm (80 inches) or more in overall width.

C. Truck tractors.

D. Semitrailers and full trailers 2,032 mm (80 inches) or more in overall width except converter dollies.

E. Converter dolly.

F. Semitrailers and full trailers less than 2,032 mm (80 inches) in overall width.

G. Pole trailers.

H. Projecting loads.

Note: Lamps and reflectors may be combined as permitted by Sec. 393.22 and S5.4 of 49 CFR 571.108, Equipment combinations.

Footnote--1 Identification lamps may be mounted on the vertical centerline of the cab where different from the centerline of the vehicle, except where

the cab is not more than 42 inches wide at the front roofline, then a single lamp at the center of the cab shall be deemed to comply with the

requirements for identification lamps. No part of the identification lamps or their mountings may extend below the top of the vehicle windshield.

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Footnote--2 Unless the turn signals on the front are so constructed (double-faced) and located as to be visible to passing drivers, two turn signals are

required on the rear of the truck tractor, one at each side as far apart as practicable.

Footnote--3 The identification lamps need not be visible or lighted if obscured by a vehicle in the same combination.

Footnote--4 Any semitrailer or full trailer manufactured on or after March 1, 1979, shall be equipped with rear side-marker lamps at a height of not

less than 381 mm (15 inches), and on the rear of trailers not more than 1,524 mm (60 inches) above the road surface, as measured from the center of

the lamp on the vehicle at curb weight.

Footnote--5 Each converter dolly, when towed singly by another vehicle and not as part of a full trailer, shall be equipped with one stop lamp, one tail

lamp, and two reflectors (one on each side of the vertical centerline, as far apart as practicable) on the rear. Each converter dolly shall be

equipped with rear turn signals and vehicular hazard warning signal flasher lamps when towed singly by another vehicle and not as part of a full

trailer, if the converter dolly obscures the turn signals at the rear of the towing vehicle.

Footnote--6 Pole trailers shall be equipped with two reflex reflectors on the rear, one on each side of the vertical centerline as far apart as

practicable, to indicate the extreme width of the trailer.

Footnote--7 Pole trailers, when towed by motor vehicles with rear identification lamps meeting the requirements of Sec. 393.11 and mounted at a height

greater than the load being transported on the pole trailer, are not required to have rear identification lamps.

Footnote--8 Pole trailers shall have on the rearmost support for the load: (1) two front clearance lamps, one on each side of the vehicle, both on the

same level and as high as practicable to indicate the overall width of the pole trailer; (2) two rear clearance lamps, one on each side of the

vehicle, both on the same level and as high as practicable to indicate the overall width of the pole trailer; (3) two rear side marker lamps, one on

each side of the vehicle, both on the same level, not less than 375 mm (15 inches) above the road surface; (4) two rear reflex reflectors, one on each

side, both on the same level, not less than 375 mm (15 inches) above the road surface to indicate maximum width of the pole trailer; and (5) one red

reflector on each side of the rearmost support for the load. Lamps and reflectors may be combined as allowed in Sec. 393.22.

Footnote--9 Any motor vehicle transporting a load which extends more than 102 mm (4 inches) beyond the overall width of the motor vehicle shall be

equipped with the following lamps in addition to other required lamps when operated during the hours when headlamps are required to be used.

(1) The foremost edge of that portion of the load which projects beyond the side of the vehicle shall be marked (at its outermost extremity) with an

amber lamp visible from the front and side.

(2) The rearmost edge of that portion of the load which projects beyond the side of the vehicle shall be marked (at its outermost extremity) with a red

lamp visible from the rear and side.

(3) If the projecting load does not measure more than 914 mm (3 feet) from front to rear, it shall be marked with an amber lamp visible from the front,

both sides, and rear, except that if the projection is located at or near the rear it shall be marked by a red lamp visible from front, side, and

rear.

Footnote--10 Projections beyond rear of motor vehicles. Motor vehicles transporting loads which extend more than 1,219 mm (4 feet) beyond the rear of

the motor vehicle, or which have tailboards or tailgates extending more than 1,219 mm (4 feet) beyond the body, shall have these projections marked as

follows when the vehicle is operated during the hours when headlamps are required to be used:

(1) On each side of the projecting load, one red side marker lamp, visible from the side, located so as to indicate maximum overhang.

(2) On the rear of the projecting load, two red lamps, visible from the rear, one at each side; and two red reflectors visible from the rear, one at

each side, located so as to indicate maximum width.

Footnote--11 To be illuminated when tractor headlamps are illuminated.

Footnote--12 Every bus, truck, and truck tractor shall be equipped with a signaling system that, in addition to signaling turning movements, shall have

a switch or combination of switches that will cause the two front turn signals and the two rear signals to flash simultaneously as a vehicular traffic

signal warning, required by Sec. 392-22(a). The system shall be capable of flashing simultaneously with the ignition of the vehicle on or off.

Footnote--13 To be actuated upon application of service brakes.

Footnote--14 Backup lamp required to operate when bus, truck, or truck tractor is in reverse.

Footnote--15

(1) For the purposes of Section 393.11, the term ``overall width'' refers to the nominal design dimension of the widest part of the vehicle, exclusive

of the signal lamps, marker lamps, outside rearview mirrors, flexible fender extensions, and mud flaps.

(2) Clearance lamps may be mounted at a location other than on the front and rear if necessary to indicate the overall width of a vehicle, or for

protection from damage during normal operation of the vehicle.

(3) On a trailer, the front clearance lamps may be mounted at a height below the extreme height if mounting at the extreme height results in the lamps

failing to mark the overall width of the trailer.

(4) On a truck tractor, clearance lamps mounted on the cab may be located to indicate the width of the cab, rather than the width of the vehicle.

(5) When the rear identification lamps are mounted at the extreme height of a vehicle, rear clearance lamps are not required to be located as close as

practicable to the top of the vehicle.

Footnote--16 A trailer subject to this part that is less than 1829 mm (6 feet) in overall length, including the trailer tongue, need not be equipped

with front side marker lamps and front side reflex reflectors.

Footnote--17 A boat trailer subject to this part whose overall width is 2032 mm (80 inches) or more need not be equipped with both front and rear

clearance lamps provided an amber (front) and red (rear) clearance lamp is located at or near the midpoint on each side so as to indicate its extreme

width.

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[70 FR 48027, Aug. 15, 2005]

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