I'm going for the "Invisible Safety Sign"...-
"If you can't see it, it can't hurt you."
As for the comment about NHTSA and DOT letting us play with fire, but anything that works on the principle of reflection and/or may require some batteries is WAY BEYOND the comprehension of mere mortal men.
Call in the Rocket Scientists!
There may, also, be required a frontal labotomy...followed up with intense neuro-shock therapy!