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USDOT pre-trip and post-trip lighting inspections

Under Federal Motor Carrier Safety Administration (FMCSA) rules, drivers must ensure all lights and reflectors are working, secure, and clean during both pre-trip and post-trip (DVIR) inspections. Lighting devices are among the most common triggers for roadside DOT violations and out-of-service orders. [1, 2, 3, 4, 5]

Pre-Trip Light Inspection

Before hitting the road, conduct a full 360-degree walk-around to verify all lights operate correctly. [1, 2]

- Clean & Undamaged: Lenses must be free of cracks, dirt, and tape. Reflectors and conspicuity (reflective) tape must not be torn or missing. [1, 2]
- Color Requirements:
  - - Front: Clear/white headlights, amber turn signals/clearance lamps.
    - Rear: Red tail lights, brake lights, and turn signals.
    - Sides: Amber on the front/middle, red on the rear. [1, 2, 3, 4, 5]
- Visibility: Headlights must be visible from at least 500 feet. [1]
- Specific Checks:
  - - Activate high and low beams, 4-way flashers, and left/right turn signals.
    - Have someone press the brake pedal (or use a brake pedal depressor) to verify brake light and ABS light activation.
    - Ensure three identification (ID) lamps are present at the top front (amber) and top rear (red) if the vehicle is over 80 inches wide. [1, 2, 3, 4, 5, 6]

Post-Trip Light Inspection

After the shift, perform another walk-around to document any damage that occurred during the day so it can be repaired before the next dispatch. [1, 2]

- Damage Check: Look for fresh cracks in lenses, broken housings, or wiring that may have been pulled loose by road debris.
- DVIR Logging: FMCSA regulations (49 CFR 396.11) require a written Driver Vehicle Inspection Report (DVIR) at the end of each day’s work. Note any defective, dim, or missing lights so the motor carrier can schedule maintenance. [1, 2, 3, 4, 5]

Common Violation Triggers

- Midpoint Marker Lamps: Trailers 30 feet or longer require intermediate (midpoint) amber side marker lamps and reflectors.
- Secure Mounting: All lamps must be mounted securely on a permanent part of the vehicle. Dangling or zip-tied lights are automatic failures.
- Corroded Wiring: Wires must not be frayed, and connections must be tight and corrosion-free. [1, 2, 3, 4]

For detailed federal regulations, you can review the full 49 CFR 393 Subpart B guidelines or refer to the FMCSA Inspection, Repair, and Maintenance Part 396 requirements.

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