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Before a road trip, check vehicle lights in a suitable parked location and record each function separately. A dashboard icon or one bright front lamp does not prove that every lamp works. Use the owner’s manual for your model, and turn an uncertain result into a clear service note. Contents 1. Start with a parked check and the owner’s manual 2. Check a function, not just a bright patch 3. Turn an uncertain result into a precise service note 4. Common questions before leaving 1. Start with a parked check and the owner’s manual NHTSA’s road-trip guidance includes headlights, brake lights, turn signals, emergency flashers and interior lights among the items to check. If a trailer is involved, its brake lights and turn signals also need attention. This is a useful starting list, not a model-specific test procedure. Choose a stationary, suitable parking location. Apply the parking brake and follow the vehicle manual for the controls and power state needed for each function. Do not run a ve...