Fatigue, Impairment & Dangerous Behavior

The Commercial Vehicle Safety Alliance's North American Standard Out-of-Service Criteria define when lighting defects are severe enough to remove a vehicle from service. Inoperable or missing required lamps, including stop lamps, tail lamps, turn signals, and headlamps, are out-of-service conditions. Missing or deteriorated conspicuity treatments are evaluated as part of the van and open-top trailer body inspection, and missing reflective tape is a citable violation under the applicable FMCSA regulations. A truck that was operating with a defect meeting the out-of-service threshold was, by the enforcement community's own standard, too dangerous to be on the road.

Under 49 C.F.R. § 396.3, every motor carrier must systematically inspect, repair, and maintain all motor vehicles subject to its control. The word "systematically" is not decorative. FMCSA has interpreted it to mean a regular, scheduled program designed to keep vehicles in safe operating condition, not a reactive approach that waits for a driver to report a problem or an inspector to find one. The maintenance records required under § 396.3(b) must include a record of inspection, repairs, and maintenance indicating their date and nature. The obligation extends to trailers the carrier does not own but operates.

Lighting failures on commercial trucks are not random. Corrosion is the most pervasive cause: the electrical connectors between the tractor and trailer are exposed to road spray, salt, moisture, and physical impact every time the tractor connects and disconnects. Vibration-related failures account for a significant share of bulb and LED failures. Wire damage is a progressive failure mode, with wiring routed along the underside of the trailer exposed to road debris impact and abrasion. Damage from loading operations--dock equipment, forklifts, and yard jockeys--can contact and break marker lamps, tear conspicuity tape, and damage wiring connections.

Under 49 C.F.R. § 393.11(b), each trailer with an overall width of 80 inches or more and a GVWR over 10,000 pounds, manufactured on or after December 1, 1993, must be equipped with a retroreflective conspicuity system meeting the requirements of FMVSS No. 108. The system must use retroreflective sheeting certified as DOT-C2 (50 mm wide), DOT-C3 (75 mm wide), or DOT-C4 (100 mm wide), or reflex reflectors, or a combination of both. The treatment must be applied to both sides and the rear of the trailer in specific configurations.