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['CMV Parts and Maintenance']
['CMV lights, reflectors, and reflective tape']
04/09/2024
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§393.11 Lighting devices and reflectors
Interpretations to Part 393 — Parts and accessories necessary for safe operation
Question 1: What is the definition of ‘‘body’’ with respect to trucks and trailers?
Guidance: The FMCSRs do not include a definition of ‘‘body.’’ However, a truck or trailer body generally means the structure or fixture designed to contain, or support, the material or property to be transported on the vehicle.
Question 2: May retroreflective tape be used in place of side reflex reflectors?
Guidance:§393.26(b) cross references FMVSS 108 (49 CFR 571.108, S5.1.1.4) which allows reflective material to be used for side reflex reflectors under the conditions described below. Retro-reflective tape conforming to Federal specification L-S-300, ‘‘Sheeting and Tape, Reflective; Non-exposed Lens, Adhesive Backing,’’ September 7, 1965, may be used in place of side reflex reflectors if this material as used on the vehicle, meets the performance standards in either Table I or Table IA of Society of Automotive Engineers J594f, Reflex Reflectors, January 1977.
Question 3:§393.11, Footnote 5, requires that each converter dolly be equipped with turn signals at the rear if the converter dolly obscures the turn signals at the rear of the towing vehicle when towed singly by another vehicle. Are turn signals required on the rear of the converter dolly when the towing of the unladen dolly prevents other motorists from seeing only a portion of the lenses of the turn signals on the towing vehicle?
Guidance: Yes. Although a portion of the rear turn signal lenses on the towing vehicle may be visible to other drivers, the turn signal generally would not satisfy the visibility requirements of FMVSS No. 108 (49 CFR 571.108) if the converter dolly prevents other motorists from seeing the entire lens. The visibility requirements of FMVSS No. 108 help to ensure that other drivers can see the turn signal from a range of positions to the rear of the vehicle. Therefore, turn signals on the towing vehicle are considered to be obscured by the converter dolly if other motorists’ view of the lens is even partially blocked.
Question 4: Does a CMV equipped with amber tail lamps in addition to the red tail lamps required to designate the rear of a CMV meet the lighting requirements of §393.11?
Guidance: No. §393.11 requires that lighting devices on CMVs placed in operation after March 7, 1989, meet the requirements of FMVSS No. 108 in effect at the time of manufacture. The NHTSA has issued interpretations which indicate that the use of amber tail lamps impairs the effectiveness of the required lighting equipment and as such is prohibited by FMVSS No. 108 (S5.1.3). Since NHTSA does not allow vehicle manufacturers to install amber tail lamps, the FHWA has concluded that the use of amber tail lamps on vehicles placed in operation after March 7, 1989, is prohibited by §393.11.
In the case of vehicles placed in operation on or before March 7, 1989, §393.11 requires that vehicles meet either the lighting requirements of part 393 or FMVSS No. 108 in effect at the time of manufacture. Prior to the December 7, 1988, final rule on part 393 (53 FR 49397), amber tail lamps were prohibited by §393.25. §393.25(e)(3) (in the October 1, 1988 edition of the Code of Federal Regulations) required all rear lamps, with certain exceptions, to be red. Since tail lamps were not included in the exceptions, the use of amber tail lamps was implicitly prohibited. Therefore, a vehicle placed in operation on or before March 7, 1989, must not be equipped with amber tail lamps because the use of such lamps meets neither the lighting requirements of part 393 nor FMVSS No. 108 in effect at the time of manufacture.
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