At one time the Feds required DOT approved, side - visible orange front and red rear reflectors (sometimes incorporated into the turn signals, sometimes separate). I don't know if anything has changed, but I notice that the new cars with factory clear front indicators all seem to have a separate amber reflector on the bumper corner or lower fender.

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E