I'm pretty sure that a clear front turn signal is illegal. Are there any cars that use a factory clear front turn signal with a clear bulb?

I'll add to EliteAccord's list, green and purple lights are illegal anywhere on the outside of a moving vehicle. Blue lights are illegal on any car other then a registered police vehicle, as are front facing red lights which are reserved for police and the fire department.

For you Canadians, I think you have to be a volunteer firefighter to have green lights, and that's only on call. At least that's what I have heard.