Originally Posted By: SHOZ
Here is the Illinois stop lamp color code.
(625 ILCS 5/) Illinois Vehicle Code.
Quote:
(625 ILCS 5/12-208) (from Ch. 95 1/2, par. 12-208)
Sec. 12-208. Signal lamps and signal devices.
(a) Every vehicle other than an antique vehicle displaying an antique plate or an expanded-use antique vehicle displaying expanded-use antique vehicle plates operated in this State shall be equipped with a stop lamp or lamps on the rear of the vehicle which shall display a red or amber light visible from a distance of not less than 500 feet to the rear in normal sunlight and which shall be actuated upon application of the service (foot) brake, and which may but need not be incorporated with other rear lamps. During times when lighted lamps are not required, an antique vehicle or an expanded-use antique vehicle may be equipped with a stop lamp or lamps on the rear of such vehicle of the same type originally installed by the manufacturer as original equipment and in working order. However, at all other times, except as provided in subsection (a-1), such antique vehicle or expanded-use antique vehicle must be equipped with stop lamps meeting the requirements of Section 12-208 of this Act.
However, it doesn't override that federal standards are different and doesn't address what happens if you take your vehicle out of state where there isn't a similar standard. In California the requirement is that only vehicles built before 1979 are allowed to have a "yellow" stoplamp.
Quote:
http://www.dmv.ca.gov/pubs/vctop/d12/vc24603.htm
24603. Every motor vehicle that is not in combination with any other vehicle and every vehicle at the end of a combination of vehicles shall at all times be equipped with stoplamps mounted on the rear as follows:
(e) Stoplamps on vehicles manufactured on or after January 1, 1979, shall emit a red light. Stoplamps on vehicles manufactured before January 1, 1979, shall emit a red or yellow light. All stoplamps shall be plainly visible and understandable from a distance of 300 feet to the rear both during normal sunlight and at nighttime, except that stoplamps on a vehicle of a size required to be equipped with clearance lamps shall be visible from a distance of 500 feet during those times.