Pennsylvania Neon Underglow Laws

Pennsylvania neon underglow usage is governed by the state's Code. All relevant laws, rules and regulations pertaining to vehicle lighting including car underglow in Pennsylvania have been provided below. Make sure to examine the regulations carefully and do not use any restricted lights.

Pennsylvania regulates neon underglow through Pennsylvania Vehicle Code, Title 67: Transportation, Chapter 175: Vehicle Equipment and Inspection, Article 66: Lighting and Electrical Systems.

Is neon underglow legal in Pennsylvania?

Pennsylvania law prohibits all additional aftermarket vehicle lighting which includes neon underglow. This means that in Pennsylvania neon underglow is illegal.

There are no provisions in PA law which would allow undercarriage lights while driving, and the law completely prohibits using any lamps not specified in the Code.

Pennsylvania vehicle lighting laws

Below are all relevant excerpts from Pennsylvania Vehicle Code that limit, restrict or allow certain aftermarket lights to be installed on vehicles.

§ 175.66. Lighting and electrical systems.

[…] (h)  Ornamental lamps. A lamp not enumerated in this section and not located as described in Tables III, IV and V of this chapter, is prohibited unless it is available as original equipment. An illuminated sign is prohibited except on taxicabs, ambulances and trucks. Flashing or revolving lights are not ornamental lamps. Provisions relating to flashing or revolving lights are in Chapters 15 and 173 (relating to authorized vehicles and special operating privileges; and flashing or revolving lights on emergency and authorized vehicles).

Underglow is not specifically mentioned and not part of vehicle’s standard nor required lighting equipment. Underglow therefore falls under the “ornamental lamps” category, and as such is not legal to use in Pennsylvania.

Our information about car neon underglow laws in Pennsylvania was last updated in 2024 and checked in 2025. We always aim to have up to date and correct information, but if you notice errors be sure to contact us. Thank you!
Check our data with your local law enforcement or other relevant agencies! Pennsylvania underglow laws in certain cities or counties may be different from state legislation. While we do our very best to provide the most accurate information about LED and neon street glow usage we will not be held liable for any potentially incorrect or misinterpreted info.
Underglow law references:

Pennsylvania Code: § 175.66. Lighting and electrical systems.

Pennsylvania Code Chapter 153: Lamps, Reflective Devices and Associated Equipment [required vehicle lighting]

State of Pennsylvania Info

Pennsylvania

Pennsylvania, officially the Commonwealth of Pennsylvania, is a US state that is located in the Northeastern and Mid-Atlantic regions of the United States, and the Great Lakes region. The state borders Delaware to the southeast, Maryland to the south, West Virginia to the southwest, Ohio to the west, Lake Erie and Ontario, Canada to the northwest, New York to the north and New Jersey to the east. Pennsylvania is the 33rd most extensive, the 6th most populous, and the 9th most densely populated of the 50 United States. The state's four most populous cities are Philadelphia, Pittsburgh, Allentown, and Erie.

Capital: Harrisburg

Population: 12,763,536

Area: 46,055 sq mi (119,283 km2)

Cities ▼

Cities in Pennsylvania: Philadelphia, Pittsburgh, Harrisburg, Allentown, Lancaster, Centralia, State College, Erie, Bethlehem, Reading, King of Prussia, York, West Chester, Gettysburg, Altoona, Easton, Carlisle, New Hope, Johnstown, Doylestown, Manheim, Latrobe, Paint, Pottstown, Greensburg, Bensalem Township, Phoenixville, Norristown, Jim Thorpe, Hazleton, Chambersburg, Malvern, Upper Darby, Media, Lititz, Lansdale, Downingtown, Green Tree, Emporium, Pottsville, Conshohocken, Wayne, New Castle, Coatesville, Cranberry Township, Washington, Chester, Quakertown, Monroeville, Lebanon

Counties ▼

Counties in Pennsylvania: Adams, Allegheny, Armstrong, Beaver, Bedford, Berks, Blair, Bradford, Bucks, Butler, Cambria, Cameron, Carbon, Centre, Chester, Clarion, Clearfield, Clinton, Columbia, Crawford, Cumberland, Dauphin, Delaware, Elk, Erie, Fayette, Forest, Franklin, Fulton, Greene, Huntingdon, Indiana, Jefferson, Juniata, Lackawanna, Lancaster, Lawrence, Lebanon, Lehigh, Luzerne, Lycoming, McKean, Mercer, Mifflin, Monroe, Montgomery, Montour, Northampton, Northumberland, Perry, Philadelphia, Pike, Potter, Schuylkill, Snyder, Somerset, Sullivan, Susquehanna, Tioga, Union, Venango, Warren, Washington, Wayne, Westmoreland, Wyoming, York

Wikipedia

State website


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