Here is your IL code, as close as I can tell, as it would relate to this conversation:
(625 ILCS 5/12-207)*(from Ch. 95 1/2, par. 12-207)*****Sec. 12-207.*
Spot lamps and auxiliary driving lamps.*****
(a) Any motor vehicle may be equipped with not to exceed one spot lamp and every lighted spot lamp shall be so aimed and used upon approaching another vehicle that no part of the high-intensity portion of the beam will be directed to the left of the prolongation of the extreme left side of the vehicle nor more than 100 feet ahead of the vehicle.*****
(b) Any motor vehicle may be equipped with not to exceed three auxiliary driving lamps mounted on the front at a height not less than 12 inches nor more than 42 inches above the level surface upon which the vehicle stands.*****
(c) (guberment exemption)*****
(d) (snowplow exemption)*(Source: P.A. 85-1010.)
Sec. 12-210.*Use of head lamps and auxiliary driving lamps.*
(a) Whenever the driver of any vehicle equipped with an electric driving head lamp, driving head lamps, auxiliary driving lamp or auxiliary driving lamps is within 500 feet of another vehicle approaching from the opposite direction, the driver shall dim or drop such head lamp or head lamps and shall extinguish all auxiliary driving lamps.*****
(b) The driver of any vehicle equipped with an electric driving head lamp, head lamps, auxiliary driving lamp or auxiliary driving lamps shall dim or drop such head lamp or head lamps and shall extinguish all auxiliary driving lamps when there is another vehicle traveling in the same direction less than 300 feet to the front of him.*****
(c) No vehicle shall have the lighting system modified to allow more than 2 electric head lamps to be lighted while operating in the dimmed or dropped position.*****
---> (d) Nothing in this Section shall prohibit the use of auxiliary driving lamps, commonly referred to as "fog" lamps, when used in conjunction with head lamps, if such auxiliary driving lamps are adjusted and so aimed that the glaring rays are not projected into the eyes of drivers of oncoming vehicles.*(Source: P.A. 85-1144.)
Sec. 12-211.*Number of driving lamps required or permitted.*****
(a) **At all times specified in Section 12-201, at least 2 lighted driving lamps shall be displayed, one on each side of the front of every motor vehicle other than a motorcycle, except when such vehicle is parked subject to the regulations governing lights on parked vehicles.
(b) Whenever a motor vehicle equipped with driving lamps as herein required is also equipped with any auxiliary driving lamps or a spot lamp or any other lamp on the front thereof, not more than a total of 4 of any such lamps on the front of a vehicle shall be lighted at any one time when upon a highway.*(Source: P.A. 86-1236.)
I see no prohibition of doing it on the state level. IANAL, but if it is in the IL vehicle code, I couldn't find it.
Originally Posted by Team Lazy
They go off because it's illegal in most (all?) places to have more than 2 lights on when the high beams are on. Check your local highway laws on lighting and it will probably say specifically that you can only have 2 lights illuminated when high beams are on. And it will probably say " no more than 2 lights to the front" or something like that.
Not Virginia. I can have 2 auxillary lights, either fog, driving, spot, or any combination of, on at any time my head lights are on, high or low.