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From: Alamosa, Colorado (200 yards from the Rio Grande)
RE: SIDE MARKER....?
I believe it is a Federal (DOT) requirement for the amber side lights. This was first required back in the 60's if I remember right and everybody raised hell about it saying there was no way they could make cool looking vehicles with the required side lights.....
There's also a Federal DOT requirement for a certain amount of the rear taillights being visible from the side, as well.
Even motorcycles have to have the sidelights, but most use reflectors.
Personally, I've never written a citation for "lights" other than red or blue neon visible from the front.....
My bulb is almost I hate to say this...but a pinkish color. It is a really light red. I need to get an LED red bulb to replace it, so its bright red.[&:]