what does it mean when there is a single non flashing blue light on top of a semi trailer along the side near the back of the trailer

by lynne
(Springfield il USA)

what does it mean when there is a single non flashing blue light on top of a semi trailer along the side near the back of the trailer

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Aug 14, 2017
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Blue Light NEW
by: B-Man

Gully Transportation out of Illinois has blue lights on the top rail of their van trailers. I believe that it is just to make it easier to identify them over the trailers of others. I'm not sure how they get away with it as DOT specifically prohibits any color other than amber or red for marker lights.

Jan 31, 2016
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Me too NEW
by: Anonymous

I am curious too

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