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During the inspection of clearance lamps, the primary function is to ensure they properly indicate the vehicle's dimensions. Clearance lamps are designed to be visible from a distance and help other drivers gauge the size and boundaries of a vehicle, particularly larger vehicles like trucks and trailers. This is essential for safety on the road, as it allows for adequate spacing and anticipating the vehicle's movements.

While examining the brightness might seem relevant, the core purpose of clearance lamps is their ability to mark the vehicular outline, especially in situations where visibility may be compromised. Replacing them with brighter versions is not typically a part of the inspection process; rather, they should be checked for compliance with existing regulations. Inspections are also not limited to night conditions, as the lamps should function correctly at all times, under varying environmental conditions.