No, white turn signals are ok in the front. I've probably already said this in this thread.Those are basically required by law to be yellow/amber (along with the front indicators) in the USA. The rear indicators are allowed to be red or amber.
Basically IIRC the way turn indicator rules are written in the USA is as follows:
Turn signals:
They can't be white
They must be red or yellow/amber
... later in the rules
Red lights may only appear on the rear of the vehicle.
which forces all of the other indicators to be yellow.
White or amber are allowed in the front. Red or amber are allowed in the rear.
Here's a reference:
http://www.leginfo.ca.gov/cgi-bin/displaycode?section=veh&group=24001-25000&file=24950-24953
24953.
(a) Any turn signal system used to give a signal of intention to turn right or left shall project a flashing white or amber light visible to the front and a flashing red or amber lightvisible to the rear.
(b) Side-mounted turn signal lamps projecting a flashing amberlight to either side may be used to supplement the front and rearturn signals. Side-mounted turn signal lamps mounted to the rear ofthe center of the vehicle may project a flashing red light no part of which shall be visible from the front.