Underglow & Auxiliary Lighting

Alabama counts auxiliary lamps one by one rather than leaving them to a general glare rule. Section 32-5-241(a) permits not more than one spot lamp, not more than two fog lamps mounted…

Alaska regulates add-on lighting in 13 AAC 04.145. Any auxiliary light, spotlight or other front-facing lamp brighter than 300 candlepower is counted toward a cap of four illuminated…

Arizona allows a vehicle four kinds of extra forward lighting and puts a mounting-height band on each: one spot lamp, two fog lamps mounted 12 to 30 inches off the ground, two…

Arkansas is one of the few states that makes it unlawful to switch auxiliary driving lights on at all unless they fit a closed list. Ark. Code § 27-36-221 permits them only where they…

California works from a closed list: Vehicle Code section 24003 says no vehicle may carry any lamp or illuminating device not required or permitted by the code, so an accessory light…

Colorado permits four categories of extra forward lighting and caps each at two lamps: spot lamps, fog lamps, auxiliary passing lamps and auxiliary driving lamps, under C.R.S. §…

Connecticut counts and measures. CGS § 14-96o allows not more than two spot lamps, two fog lamps, two auxiliary passing lamps and two auxiliary driving lamps, and gives each of the…

Delaware allows extra forward lighting only in the exact quantities and mounting heights set by 21 Del. C. § 4346: two spot lamps, two fog lamps mounted 12 to 30 inches off the ground…

The District allows extra lamps only in the specific categories 18 DCMR § 711 names, and it caps each at two. A vehicle may carry not more than two spot lamps, two fog lamps mounted 12…

Florida is one of the states that says yes to underbody lighting in so many words. Fla. Stat. § 316.235(3) provides that any motor vehicle may be equipped with one or more lamps or…

Georgia counts extra lamps rather than describing them. O.C.G.A. section 40-8-29 allows a vehicle not more than one spotlight, not more than two foglights mounted 12 to 30 inches high…

Hawaii's toughest lighting rule is about colour, not brightness. HRS §291-31.5 makes it an offense to knowingly operate, affix, display or even possess any lamp, reflector or…

Idaho Code § 49-918 lets any motor vehicle carry up to two spot lamps, two fog lamps, two auxiliary passing lamps and two auxiliary driving lamps, each with its own mounting height…

Illinois runs a closed list for vehicle lighting. Under 625 ILCS 5/12-212(c), all lighting on a vehicle other than what the Vehicle Code expressly authorises is prohibited, so the…

Indiana licenses extra lamps by name and by count. Ind. Code §§ 9-19-6-13 through 9-19-6-16 allow a motor vehicle not more than two spot lamps, not more than two fog lamps mounted 12…

Iowa answers add-on lighting with numbers rather than generalities. Iowa Code section 321.403 allows no more than three auxiliary driving lamps, mounted on the front between 12 and 42…

Kansas allows auxiliary lighting but counts and measures it. K.S.A. 8-1719 permits not more than two spot lamps, two fog lamps, two auxiliary passing lamps and two auxiliary driving…

Kentucky limits every visible light you add to a vehicle by color and by whether it flashes. Under KRS 189.040(14), visible front lights may only be white or amber and visible rear…

Louisiana allows a car no more than two fog lamps mounted 12 to 30 inches off the ground, no more than two auxiliary passing lamps at 24 to 42 inches, and no more than two auxiliary…

Maine regulates extra lighting by a dedicated section, 29-A MRS §1909-B, and it is strict. An auxiliary light must be white or amber on the front, amber on the side, and amber or red…

Maryland lets you add auxiliary lighting, but it counts the lamps and measures the mounting height. Transportation Article § 22-217 allows one spot lamp, no more than two fog lamps…

Massachusetts bars any vehicle from mounting or displaying a flashing, rotating or oscillating light in any direction except under G.L. c. 90, section 7E, and section 7E hands out red…

Michigan runs a closed list rather than a list of banned colors. MCL 257.698(4) provides that unless a lamp is both covered and unlit, a vehicle on Michigan highways must not carry a…

Minnesota allows extra forward lighting but counts and measures it. Minn. Stat. 169.56 lets any motor vehicle carry no more than two spot lamps, two fog lamps mounted 12 to 30 inches…

Mississippi regulates extra vehicle lighting mainly by colour and by count. Miss. Code Ann. Section 63-7-19 reserves blinking, oscillating or rotating blue lights to police vehicles…

Missouri caps aftermarket forward lighting by count and by height. Mo. Rev. Stat. Section 307.080 allows a motor vehicle no more than three auxiliary lamps, all mounted on the front…

Montana counts your extra lamps. Section 61-9-217, MCA, allows no more than two spot lamps, no more than two fog lamps and no more than two auxiliary driving lamps, each with its own…

Nebraska allows a motor vehicle no more than two auxiliary driving lights, mounted on the front between twelve and forty-two inches above the surface the vehicle stands on, and each…

Nevada counts auxiliary lamps rather than rating them. NRS 484D.180 lets any motor vehicle carry up to two spot lamps, up to two auxiliary driving lamps mounted 16 to 42 inches above…

RSA 266:37 lets a New Hampshire vehicle carry no more than 2 spot lamps and no more than 3 auxiliary driving lamps, mounted on the front between 12 and 42 inches above the ground…

New Jersey controls add-on lighting with an aiming rule, a counting rule and a flat ban on flashing. Under R.S. 39:3-54, any lighted lamp other than a headlamp, spot lamp or auxiliary…

Vehicle and Traffic Law section 375(41) governs every light added to a New York vehicle beyond the lamps the law already requires, and it opens with a near total prohibition: no light…

North Carolina lets any motor vehicle carry up to two spot lamps and up to two front auxiliary driving lamps, and it caps every other added lamp at 25 candlepower unless the beam is…

North Dakota permits extra forward lighting in four named categories and caps each of them at two lamps: spot lamps, fog lamps, auxiliary passing lamps and auxiliary driving lamps, all…

Ohio caps extra forward lighting by count, by mounting height and by total brightness, and it splits the numbers between the Revised Code and the Director of Public Safety's rules…

Oklahoma allows a private vehicle no more than two spot lamps, two front fog lamps or two rear fog lamps, two auxiliary driving lamps and two daytime running lamps, and 47 O.S. Section…

Oregon lets you add auxiliary lights, but ORS 816.060 defines the term narrowly and attaches four hard conditions. An "auxiliary light" in Oregon is a low beam auxiliary light; the…

Pennsylvania allows a passenger vehicle or light truck exactly one pair of approved auxiliary driving lamps and fog lamps, mounted at least 20 inches apart from center to center and no…

Rhode Island writes auxiliary lighting as a closed permission list with hard counts. R.I. Gen. Laws chapter 31-24 allows not more than two spot lamps, not more than two road or fog…

South Carolina permits extra lamps only from a closed list with fixed counts and mounting heights: one spot lamp, two fog lamps, one auxiliary passing lamp and one auxiliary driving…

South Dakota lets any motor vehicle carry up to three auxiliary driving lamps on the front, mounted between twelve and twenty-four inches above the road surface, under SDCL 32-17-17…

Tennessee allows auxiliary road lighting lamps, but T.C.A. § 55-9-402(a)(2) lets only two of them burn at any one time on top of the two required headlights. Anything that shows to the…

Texas regulates extra lighting by color, count, height and aim rather than by naming underglow. Transportation Code Section 547.305 bars any lamp showing red from directly in front of…

Utah wrote a dedicated auxiliary lighting provision into the traffic code in 2024. Utah Code Section 41-6a-1604(7) says an auxiliary light installed on a motor vehicle may only be…

23 V.S.A. § 1251(a) makes it unlawful to operate a vehicle on a Vermont highway equipped with a siren, an emergency warning lamp, or a blue light of any kind without a permit from the…

Virginia runs a closed list. Va. Code 46.2-1020 names the extra lights a private vehicle may carry, and anything not on that list, not permitted elsewhere in the lighting article, and…

Washington splits its extra-lighting rules between the statute and the State Patrol's rules, and the part most drivers care about lives in the rules. RCW 46.37.180 allows up to two…

West Virginia counts and positions each class of add-on lamp separately in W. Va. Code §17C-15-17. A car may carry one spot lamp, two fog lamps mounted 12 to 30 inches high, two…

Wisconsin's rule on extra lighting is a colour rule with a count attached. Wis. Stat. § 347.07(2) bars operating any vehicle on a highway displaying a colour other than white or amber…

Wyoming allows extra lamps but fences them in four ways. W.S. 31-5-927 permits no more than four lamps on the front of a vehicle to be lighted at any one time on a highway, counting…