Thinking about underglow for your car in Massachusetts? Here is what the law says, and how to run it legally. Ready to install? See our RGBIC underglow kit and the install guide.

Is Underglow Legal in Massachusetts? (2026 Guide)

Two rules are nearly universal across the US: no red light shown to the front and no blue underglow (both reserved for emergency vehicles), and no flashing, rotating, or strobing while driving. Beyond that, states differ. Here is how Massachusetts handles it.

Underglow rules in Massachusetts

• Prohibited device: Massachusetts regulation expressly lists neon undercarriage lighting as a prohibited device. This is one of the strictest states, do not rely on a parked or private-only exception for on-road vehicles.
• Colors: Blue lights are prohibited, and flashing, rotating, or oscillating lights are prohibited without a permit.
• Driving vs parked: Treated as a prohibited device rather than a color rule.

Underglow while parked or on private property

Because Massachusetts does not permit lit underglow on public roads, genuinely private property, a private lot, driveway, car show, or off-road, is the practical place to enjoy it, and those road rules generally do not reach private property. Be aware that a car parked on a public street is usually still treated as being on the highway, and red or blue lighting can trigger separate police-impersonation laws regardless of motion. Keep to compliant colors and check local ordinances.

How to stay legal with underglow in Massachusetts

• Keep the lights steady-burning, never flashing, strobing, or rotating.
• Show no red light to the front, and avoid blue entirely.
• Do not mimic emergency-vehicle lighting or obscure your license plate.
• Confirm the current rule below and check locally before driving with it on.

The law

540 CMR 22.07 (Registry of Motor Vehicles) and M.G.L. c. 90, section 7E, verified against the mass.gov regulation. You can read the referenced law here: Massachusetts statute.

Ready to install?

Our RGBIC underglow kit lets you dial in any color and keep it steady, and the install guide covers wiring it to a switched power source. Free shipping on all US orders.

Massachusetts Underglow FAQ

Is underglow legal in Massachusetts?
Underglow is not permitted; Massachusetts specifically names neon undercarriage lighting as a prohibited device. Keep the lights steady, show no red to the front, and avoid blue.

What underglow colors are illegal in Massachusetts?
Neon undercarriage lighting is banned as a device, and blue lights are prohibited. Flashing or strobing of any color is not allowed.

Can I have underglow on while parked in a lot?
On genuinely private property, such as a private lot, driveway, or car show, underglow use is generally far less restricted. On a public street a parked car is usually still treated as being on the highway, so the color rules still apply, avoid red and blue, and check your local ordinances.

Updated July 2026.