Idaho Code § 49-910: Color of clearance lamps, side marker lamps, and reflectors.

(1) Front clearance lamps and marker lamps and reflectors mounted on the front or on the side near the front of a vehicle shall display or reflect an amber color.

(2) Rear clearance lamps and marker lamps and reflectors mounted on the rear or on the sides near the rear of a vehicle shall display or reflect a red color.

(3) All lighting devices and reflectors mounted on the rear of any vehicle shall display or reflect a red color, except the stoplight or other signal device, which may be red, amber, or yellow, and except that the light illuminating the license plate shall be white and the light emitted by a back-up lamp may be white, amber, or red.