Old thread but thought it was worth a dig.
I was following a BMW rear ended on a tow truck last week... I noticed that they have "red out" indicators. but because it had been in a smash i got to see thier "secret" for an orange blink. (tails smashed)
behind the red lense is a Green film of some sort (couldnt get close enough). . . . red + green with the standard "clear" globe = yellow/orange flash!!. . . . there it is... one of the rivals secrets revealed!!