Underglow in Massachusetts
Underglow may not be used on public roads in Massachusetts. Aftermarket neon and underbody lighting may not be displayed on public ways under RMV regulation 540 CMR 22.07, and flashing or rotating lights are separately banned with red and blue reserved.
Verified against primary sources · August 2026
What the law says
Aftermarket neon and underbody lighting may not be displayed on public ways under RMV regulation 540 CMR 22.07, and flashing or rotating lights are separately banned with red and blue reserved. Mounting the lighting is not itself an offense; using it on a public road is. Private property is where it can be run.
Specific Limits
- Allowed
- parked on private property
- While driving
- prohibited
Exceptions & Exemptions
Underglow lights are generally prohibited while driving on public roads. Red and blue colors are specifically prohibited as they are reserved for emergency vehicles. White and amber may be permitted when vehicle is parked.
Frequently Asked Questions
Are underglow legal in Massachusetts?
What are the exact underglow limits in Massachusetts?
Are there exceptions for underglow in Massachusetts?
Street-legal underglow picks
Gear that helps you mod without a ticket in Massachusetts.
The glow that's legal in every state — inside the cabin instead of under it.
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