4 on a truck tractor clearance lamps mounted on the cab may be located to indicate the width of the cab rather than the width of the vehicle.
Clearance lights on a truck.
The first purpose of clearance lights is to alert drivers to a larger truck s presence on the road.
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And so that s why certain vehicles have little orange marker lights on the roof.
This is why you see these lights on an f 150 raptor over 80 inches wide and not on a regular f 150 79 9 inches wide likely not a coincidence.
It s also why you see the lights on heavy duty trucks and not light duty models.
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Since they have a much wider stance than most other vehicles it s crucial to know and give more space to riders of these trucks on roads that are narrower than usual.
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5 when the rear identification lamps are mounted at the extreme height of a vehicle rear clearance lamps are not required to be located as close as practicable to the top of the vehicle.