tried a quick web search and couldn't come up with anything other than wider than 80 inches. one answer to the question was:
"There are five lights across the roof above the windshield. The two outside lights are called "clearance lights" because they show the outside dimensions, both vertical and horizontal, of the vehicle. The three lights in the middle are called "identification" or "i.d." lights because they indicate the vehicle is at least 80 inches wide.
Normally these lights are on vehicles that are used for commercial purposes and may be pulling trailers, such as construction companies, towing companies, things like that where the lights are required by law.
As far as Joe Cowboy putting them across his truck cab to look cool, if you look closer you'll probably see led lights under the tailgate, chrome naked lady mudflaps, diamond plate running boards, etc etc.
I'm sure you see where this is going. "
bumpy
