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They provide virtually no illumination, they don't help drivers see, and they're mounted too high on trucks to actually do any real, productive work.. It's also why you see the lights on heavy-duty trucks and not light-duty models. And so that's why certain vehicles have little orange marker lights on the roof.
Cab clearance lights, not sure but I believe they are required over a certain weight. If you look at buses and cube trucks you'll see lights at their .
I was wondering if there IS a purpose to roof clearnace lights on p/u trucks.. Yes the clearance lights on the roof of the truck is to designate that .
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If you refer to the lights on the front and sides of the cabs, where I drive they are. The orange lights on the truck and trailer are known as "marker" lights. They help delineate the dimensions of the vehicle by illuminating points at the ends, middle, top & bottom.. So those are the reasons and the purpose of marker lights.