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  • § 393.1
    Scope of the rules in this part.
  • § 393.3
    Additional equipment and accessories.
  • § 393.5
    Definitions.
  • § 393.7
    Matter incorporated by reference.
  • § 393.9
    Lamps operable, prohibition of obstructions of lamps and reflectors.
  • § 393.11
    Lamps and reflective devices.
  • § 393.13
    Retroreflective sheeting and reflex reflectors, requirements for semitrailers and trailers manufactured before December 1, 1993.
  • § 393.17

    Lamps and reflectors—combinations in driveaway-towaway operation.

  • § 393.19
    Hazard warning signals.
  • § 393.20
  • § 393.22
    Combination of lighting devices and reflectors.
  • § 393.23
    Power supply for lamps.
  • § 393.24
    Requirements for head lamps, auxiliary driving lamps and front fog lamps.
  • § 393.25
    Requirements for lamps other than head lamps.
  • § 393.26
    Requirements for reflectors.
  • § 393.27
  • § 393.28
    Wiring systems.
  • § 393.29
  • § 393.30
    Battery installation.
  • §§ 393.31-393.33
  • § 393.40
    Required brake systems.
  • § 393.41
    Parking brake system.
  • § 393.42

    Brakes required on all wheels.

  • § 393.43
    Breakaway and emergency braking.
  • § 393.44
    Front brake lines, protection.
  • § 393.45
    Brake tubing and hoses; hose assemblies and end fittings.
  • § 393.46
  • § 393.47
    Brake actuators, slack adjusters, linings/pads and drums/rotors.
  • § 393.48
    Brakes to be operative.
  • § 393.49
    Control valves for brakes.
  • § 393.50
    Reservoirs required.
  • § 393.51
    Warning signals, air pressure and vacuum gauges.
  • § 393.52
    Brake performance.
  • § 393.53
    Automatic brake adjusters and brake adjustment indicators.
  • § 393.55
    Antilock brake systems.
  • § 393.60
    Glazing in specified openings.
  • § 393.61
    Truck and truck tractor window construction.
  • § 393.62
    Emergency exits for buses.
  • § 393.63
  • § 393.65
    All fuel systems.
  • § 393.67
    Liquid fuel tanks.
  • § 393.68
    Compressed natural gas fuel containers.
  • § 393.69
    Liquefied petroleum gas systems.
  • § 393.70
    Coupling devices and towing methods, except for driveaway-towaway operations.
  • § 393.71
    Coupling devices and towing methods, driveaway-towaway operations.
  • § 393.75
    Tires.
  • § 393.76
    Sleeper berths.
  • § 393.77
    Heaters.
  • § 393.78
    Windshield wiping and washing systems.
  • § 393.79
    Windshield defrosting and defogging systems.
  • § 393.80
    Rear-vision mirrors.
  • § 393.81
    Horn.
  • § 393.82
    Speedometer.
  • § 393.83
    Exhaust systems.
  • § 393.84
    Floors.
  • § 393.85
  • § 393.86
    Rear impact guards and rear end protection.
  • § 393.87
    Warning flags on projecting loads.
  • § 393.88
    Television receivers.
  • § 393.89
    Buses, driveshaft protection.
  • § 393.90
    Buses, standee line or bar.
  • § 393.91
    Buses, aisle seats prohibited.
  • § 393.92
  • § 393.93
    Seats, seat belt assemblies, and seat belt assembly anchorages.
  • § 393.94
    Interior noise levels in power units.
  • § 393.95
    Emergency equipment on all power units.
  • § 393.100
    Which types of commercial motor vehicles are subject to the cargo securement standards of this subpart, and what general requirements apply?
  • § 393.102
    What are the minimum performance criteria for cargo securement devices and systems?
  • § 393.104
    What standards must cargo securement devices and systems meet in order to satisfy the requirements of this subpart?
  • § 393.106
    What are the general requirements for securing articles of cargo?
  • § 393.108
    How is the working load limit of a tiedown, or the load restraining value of a friction mat, determined?
  • § 393.110
    What else do I have to do to determine the minimum number of tiedowns?
  • § 393.112
    Must a tiedown be adjustable?
  • § 393.114
    What are the requirements for front end structures used as part of a cargo securement system?
  • § 393.116
    What are the rules for securing logs?
  • § 393.118
    What are the rules for securing dressed lumber or similar building products?
  • § 393.120
    What are the rules for securing metal coils?
  • § 393.122
    What are the rules for securing paper rolls?
  • § 393.124
    What are the rules for securing concrete pipe?
  • § 393.126
    What are the rules for securing intermodal containers?
  • § 393.128
    What are the rules for securing automobiles, light trucks and vans?
  • § 393.130
    What are the rules for securing heavy vehicles, equipment and machinery?
  • § 393.132
    What are the rules for securing flattened or crushed vehicles?
  • § 393.134
    What are the rules for securing roll-on/roll-off or hook lift containers?
  • § 393.136
    What are the rules for securing large boulders?
  • § 393.201
    Frames.
  • § 393.203
    Cab and body components.
  • § 393.205
    Wheels.
  • § 393.207
    Suspension systems.
  • § 393.209

    Steering wheel systems.

Part 393
PARTS AND ACCESSORIES NECESSARY FOR SAFE OPERATION

§ 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 § 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).

(c) Prohibition on the use of amber stop lamps and tail lamps. No 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.

Table 1 of §393.11—Required Lamps and Reflectors on Commercial Motor Vehicles

Items on the VehicleQuantityColorLocationPositionHeight above the road surface in millimeters (mm) (with English units in parenthesis) measured from the center of the lamp at curb weightVehicles for which the devices are required
Headlamps2WhiteFrontOn the front at the same height, with an equal number at each side of the vertical center line as far apart as practicableNot less than 559 mm (22 inches) nor more than 1,372 mm (54 inches)A,B,C
Turn signal (front). See footnotes #2 and 122AmberAt or near the frontOne on each side of the vertical centerline at the same height and as far apart as practicableNot less than 381 mm (15 inches) nor more than 2,108 mm (83 inches)A,B,C
Identification lamps (front). See footnote #13AmberFrontAs close as practicable to the top of the vehicle, at the same height, and as 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 cabAll three on the same level as close as practicable to the top of the motor vehicleB,C
Tail lamps. See footnotes #5 and 112RedRearOne lamp on each side of the vertical centerline at the same height and as far apart as practicableBoth on the same level between 381 mm (15 inches) and 1,829 mm (72 inches)A,B,C,D,E,F,G,H
Stop lamps. See footnotes #5 and 132RedRearOne lamp on each side of the vertical centerline at the same height and as far apart as practicableBoth on the same level between 381 mm (15 inches) and 1,829 mm (72 inches)A,B,C,D,E,F,G
Clearance lamps. See footnotes #8, 9, 10, 15 & 172AmberOne on each side of the front of the vehicleOne on each side of the vertical centerline to indicate overall widthBoth on the same level as high as practicableB,C,D,G,H
 2RedOne on each side of the rear of the vehicleOne on each side of the vertical centerline to indicate overall widthBoth on the same level as high as practicableB,D,G,H
Reflex reflector, intermediate (side)2AmberOne on each sideAt or near the midpoint between the front and rear side marker lamps, if the length of the vehicle is more than 9,144 mm (30 feet)Between 381 mm (15inches) and 1,524 (60 inches)A,B,D,F,G
Reflex reflector (rear). See footnotes #5, 6, and 82RedRearOne on each side of the vertical centerline, as far apart as practicable and at the same heightBoth on the same level, between 381 mm (15 inches) and 1,524 mm (60 inches)A,B,C,D,F,G
Reflex reflector (rear side)2RedOne on each side (rear)As far to the rear as practicableBoth on the same level, between 381 mm (15 inches) and 1,524 mm (60 inches)A,B,D,F,G
Reflex reflector (front side). See footnote #162AmberOne on each side (front)As far to the front as practicableBetween 381 mm (15 inches) and 1,524 mm (60 inches)A,B,C,D,F,G
License plate lamp (rear). See footnote #111WhiteAt rear license plate to illuminate the plate from the top or sides No requirementsA,B,C,D,F,G
Side marker lamp (front). See footnote #162AmberOne on each sideAs far to the front as practicableNot less than 381 mm (15 inches)A,B,C,D,F
Side marker lamp intermediate2AmberOne on each sideAt or near the midpoint between the front and rear side marker lamps, if the length of the vehicle is more than 9,144 mm (30 feet)Not less tan 381 mm (15 inches)A, B, D, F, G
Side marker lamp (rear). See footnotes #4 and 82RedOne on each sideAs far to the rear as practicableNot less than 381 mm (15 inches), and on the rear of trailers not more than 1,524 mm (60 inches)A, B, D, F, G
Turn signal (rear). See footnotes #5 and 122Amber or redRearOne lamp on each side of the vertical centerline as far apart as practicableBoth on the same level, between 381 mm (15 inches) and 2,108 mm (83 inches)A,B,C,D,E,F,G
Identification lamp (rear). See footnotes #3, 7, and 153RedRearOne as close as practicable to the vertical centerline. One on each side with lamp centers spaced not less than 152 mm (6 inches) or more than 305 mm (12 inches) apartAll three on the same level as close as practicable to the top of the vehicleB,D,G
Vehicular hazard warning signal flasher lamps. See footnotes #5 and 122AmberFrontOne lamp on each side of the vertical centerline, as far apart as practicableBoth on the same level, between 381 mm (15 inches) and 2,108 mm (83 inches)A,B,C
 2Amber or redRearOne lamp on each side of the vertical centerline, as far apart as practicableBoth on the same level, between 381 mm (15 inches) and 2,108 mm (83 inches)A,B,C,D,E,F,G
Backup lamp. See footnote #141 or 2WhiteRearRearNo requirementA,B,C
Parking lamp2Amber or white
 
FrontOne lamp on each side of the vertical centerline, as far apart as practicableBoth on the same level, between 381 mm (15 inches) and 2,108 mm (83 inches)A

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 §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.

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 §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 §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 §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 §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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Citation:

[70 FR 48027, Aug. 15, 2005, as amended at 72 FR 32014, June 11, 2007; 72 FR 33562, June 18, 2007; 78 FR 58484, Sept. 24, 2013]


Disclaimer:

Although we make every effort to assure that the information we provide is complete and accurate, it is not intended to take the place of published agency regulations. Regulations issued by the U.S. Department of Transportation and its Operating Administrations are published in the Federal Register and compiled in the U.S. Code of Federal Regulations (CFR). Copies of appropriate volumes of the CFR in book format may be purchased from the Superintendent of Documents, U.S. Government Printing Office, or examined at many libraries.

The CFR may also be viewed online at http://ECFR.gpoaccess.gov.