Underglow Laws by State
Compare underglow regulations across all 50 states.
| State | Status | Key limits | |
|---|---|---|---|
| Alabama | Conditional | Restrictions: No red visible from the front, no blue (emergency mimicry), and no flashing. While driving: allowed | Details → |
| Alaska | Conditional | Colors: no color other than those specified in the lighting chapter Flashing: prohibited Red front: prohibited — no red light visible from directly in front of the centre +1 more on the state page | Details → |
| Arizona | Conditional | Flashing: prohibited except emergency, school bus, snow removal, and signals Bright lamps: lamps over 300 candlepower must be aimed within 75 ft; no more than 4 such front lamps lit at once Front colors: lights visible from the front must be amber or white; no red or red-and-blue from the front | Details → |
| Arkansas | Conditional | Restrictions: Front-visible light must be white or amber, no red from the front, and no flashing or rotating (a Class A misdemeanor). While driving: allowed | Details → |
| California | Conditional | Banned: red visible from front; flashing; within 12 in of required lamps While driving: allowed Max brightness: 0.05 candela/sq in +1 more on the state page | Details → |
| Colorado | Conditional | Green: green light use is limited to a stationary emergency command post Red blue: a non-emergency vehicle may not even carry a lamp capable of showing red or blue from directly in front (class 2 misdemeanor) Front colors: extra front lamps show white or amber | Details → |
| Connecticut | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Delaware | Conditional | Restrictions: No red visible from the front, no blue (emergency only), and flashing is restricted to authorized vehicles. While driving: allowed | Details → |
| Florida | Conditional | Banned: red or red-white or blue visible from front; flashing While driving: allowed | Details → |
| Georgia | Conditional | Blue: banned in any form — flashing or steady (law-enforcement exceptions) Flashing: flashing or revolving red and green are restricted to authorized vehicles; signal flashes excepted Colors note: steady red or green accent light is not addressed by these sections; white or amber is the safe configuration | Details → |
| Hawaii | Conditional | Restrictions: Front-visible light must be white or amber and rear red, with no flashing; blue is banned on all vehicles. While driving: allowed | Details → |
| Idaho | Conditional | Restrictions: No flashing, no red visible from the front, and no blue (police only); white or amber to the front is the safe choice. While driving: allowed | Details → |
| Illinois | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Indiana | Conditional | Restrictions: No red or blue, no flashing, and front-visible light limited to white or amber; green is reserved for EMS. While driving: allowed | Details → |
| Iowa | Conditional | Restrictions: Front-visible light may be only white, amber, or yellow and rear only red; blue is never allowed and all flashing is banned. While driving: allowed | Details → |
| Kansas | Conditional | Restrictions: Front-visible light must be white or amber with no red from the front, rear red, no flashing, and beams over 300 candlepower aimed within 75 feet. While driving: allowed | Details → |
| Kentucky | Conditional | Restrictions: Front-visible light must be white or amber, with no red to the front, no blue, and no flashing except turn signals and hazards. While driving: allowed | Details → |
| Louisiana | Conditional | Restrictions: No red or green visible from the front, no blue on non-emergency vehicles, and no flashing. While driving: allowed | Details → |
| Maine | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Maryland | Conditional | Restrictions: Lighting must be steady — oscillating, rotating, and blinking lights are banned unless authorized — with red and blue reserved for emergency vehicles, white or amber to the front, and no white to the rear. While driving: allowed | Details → |
| Massachusetts | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Michigan | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Minnesota | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Mississippi | Conditional | Restrictions: Blue is limited to law enforcement, red is restricted to emergency uses, and alternating flashing headlights are banned. While driving: allowed | Details → |
| Missouri | Conditional | Restrictions: Red, blue, flashing, and rotating lights are reserved for permitted emergency and work vehicles (a Class A misdemeanor otherwise); steady amber, white, and other non-red/blue colors are fine. While driving: allowed | Details → |
| Montana | Conditional | Restrictions: No blue (emergency only), no red to the front, no rotating or flashing, and beams over 300 candlepower aimed within 75 feet. While driving: allowed | Details → |
| Nebraska | Conditional | Restrictions: No flashing or rotating, no red or green visible from the front, and rear light limited to red, yellow, or amber. While driving: allowed | Details → |
| Nevada | Conditional | Restrictions: No red or blue (emergency colors), front-facing lamps limited to amber or white and rear to red, and no flashing. While driving: allowed | Details → |
| New Hampshire | Conditional | Restrictions: All forward-facing light must be white or amber and rear light red; there is no underglow-specific ban. While driving: allowed | Details → |
| New Jersey | Conditional | Banned: red (emergency-only); blue; flashing | Details → |
| New Mexico | Conditional | Restrictions: No red visible from the front, no flashing, and blue reserved for emergency vehicles. While driving: allowed | Details → |
| New York | Conditional | Safe color: steady white While driving: restricted | Details → |
| North Carolina | Conditional | Banned: red in operation; blue even possessed on the vehicle; white to rear; flashing amber While driving: allowed | Details → |
| North Dakota | Conditional | Restrictions: No red or green visible from the front and no flashing. While driving: allowed | Details → |
| Ohio | Conditional | Restrictions: No flashing, rotating, or oscillating lights, and auxiliary lamps are capped at 300 candlepower with aiming limits. While driving: allowed | Details → |
| Oklahoma | Conditional | Restrictions: No red, blue, or green visible from directly in front, and no flashing or oscillating (a misdemeanor). While driving: allowed | Details → |
| Oregon | Conditional | Restrictions: No red visible from the front, blue reserved for police, and no flashing or strobe effects. While driving: allowed | Details → |
| Pennsylvania | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Rhode Island | Conditional | Restrictions: No red or blue (reserved for emergency vehicles), no flashing, and the license plate must remain visible. While driving: allowed | Details → |
| South Carolina | Conditional | Restrictions: No red or blue visible from directly in front, and no flashing or oscillating. While driving: allowed | Details → |
| South Dakota | Conditional | Restrictions: Red visible from the front and blue anywhere are Class 2 misdemeanors, and no more than three auxiliary lamps may be used. While driving: allowed | Details → |
| Tennessee | Conditional | Restrictions: No red or blue visible from the front and no flashing toward the front. While driving: allowed | Details → |
| Texas | Conditional | Banned: red visible from front; red/white/blue beacons; flashing While driving: allowed | Details → |
| Utah | Conditional | Restrictions: No red or blue visible from directly in front, no flashing or rotating, and rear-facing light must show red. While driving: allowed | Details → |
| Vermont | Conditional | Colors: no blue of any kind without a permit; red requires a permit (rear red standard); flashing in any color other than amber prohibited Approval: reflector-equipped devices over 4 candlepower need Commissioner approval during lighting hours | Details → |
| Virginia | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Washington | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| West Virginia | Conditional | Restrictions: No flashing (emergency vehicles only), red and blue reserved, and beams over 300 candlepower aimed within 75 feet. While driving: allowed | Details → |
| Wisconsin | Conditional | Allowed: parked on private property While driving: prohibited | Details → |
| Wyoming | Conditional | Aiming: non-headlamp devices over 300 candlepower must not strike the roadway beyond 75 ft Colors: no red or blue visible from directly in front on non-emergency vehicles; rear-mounted devices must show red Flashing: prohibited except for statutorily authorized vehicles (emergency, school bus, construction, wreckers, utility, and similar) | Details → |
Limits shown apply to sedans, or to all vehicles where the law doesn't distinguish. Vehicle-specific rules, exceptions, and statute citations are on each state's page.
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