Missouri Neon Underglow Laws

Neon underglow lights have long been a popular way for car enthusiasts to add a unique and eye-catching element to their vehicles. These vibrant lights can create a distinctive look and set a car apart from the rest. However, if you’re in Missouri and considering adding neon underglow to your vehicle, it’s important to understand the state’s laws and regulations regarding this aftermarket lighting.

Is neon underglow legal in Missouri?

Missouri law allows for additional vehicle lighting, including neon underglow, without specific restrictions. However, there are certain guidelines to follow:

  1. No red color should be visible from the front of the vehicle.
  2. Flashing neon lights are not permitted.
  3. License plate illumination must be in white.

Furthermore, it is advisable to avoid using red and blue colors on any aftermarket lights on your car, including underbody glow. While the State of Missouri does not explicitly prohibit the use of blue color, it’s recommended to avoid it because many states restrict blue lighting as it can be mistaken for a police or emergency vehicle.

In summary, there are no specific Missouri laws that prohibit or restrict the installation of neon car underglow, making it generally legal to use while driving in the state.

Missouri Neon Undeglow lighting laws

Here are the pertinent excerpts from the Missouri Vehicle Code that outline regulations pertaining to the installation of specific aftermarket lights on vehicles.

Section 307.075 – Taillamps, reflectors–violations, penalty

1. Every motor vehicle and every motor-drawn vehicle shall be equipped with at least two rear lamps, not less than fifteen inches or more than seventy-two inches above the ground upon which the vehicle stands, which when lighted will exhibit a red light plainly visible from a distance of five hundred feet to the rear. Either such rear lamp or a separate lamp shall be so constructed and placed as to illuminate with a white light the rear registration marker and render it clearly legible from a distance of fifty feet to the rear.

Section 307.095 – Colors of various lamps–restriction of red lights, penalty

1. Headlamps, when lighted, shall exhibit lights substantially white in color; auxiliary lamps, cowllamps and spotlamps, when lighted, shall exhibit lights substantially white, yellow or amber in color. No person shall drive or move any vehicle or equipment, except a school bus when used for school purposes or an emergency vehicle upon any street or highway with any lamp or device thereon displaying a red light visible from directly in front thereof.

2. Notwithstanding the provisions of section 307.120, violation of this section is an infraction.

Section 307.100 – Limitations on lamps other than headlamps–flashing signals prohibited except on specified vehicles–penalty.

[…] flashing warning signals […] are prohibited on other motor vehicles, motorcycles and motor-drawn vehicles except as a means for indicating a right or left turn.


Any individual who violates any of the stipulations within sections 307.020 to 307.120 will, upon conviction, be considered to have committed a misdemeanor.

When Is It Legal to Use Neon Underglow Lights in Missouri?

  1. Color Restrictions: In Missouri, neon underglow lights must emit a non-distracting color that does not resemble any emergency vehicle lighting. As such, you can legally use neon underglow lights that emit colors like white, amber, green, and blue, among others, as long as they don’t resemble police or emergency vehicle lights.
  2. Non-Distracting Use: You can use neon underglow lights while driving as long as they don’t create a distraction to other drivers on the road. Strobe or flashing effects are not allowed.
  3. Proper Installation: Ensure that your neon underglow lights are securely and properly installed. Loose or dangling lights can create hazards on the road.
  4. Brightness: The lights should not be excessively bright. Excessively bright lights can be blinding to other drivers and are typically not allowed.

When Is It Illegal to Use Neon Underglow Lights in Missouri?

  1. Flashing or Strobing Lights: Using neon underglow lights that flash or strobe while driving is illegal and can distract other drivers. It’s important to keep these lights steady and non-flashing.
  2. Colors Resembling Emergency Vehicles: Using neon underglow lights that closely resemble the colors of police or emergency vehicle lights, such as red or blue, is prohibited. This can lead to confusion and potentially dangerous situations on the road.

Is It Illegal to Install Neon Underglow Lights in Missouri?

Missouri law does not explicitly prohibit the installation of neon underglow lights on vehicles. However, it’s essential to install them correctly, in compliance with the regulations mentioned above.

Traffic Ticket or Summons for Violating Neon Underglow Laws

If you violate Missouri’s regulations regarding neon underglow lights, you may be subject to a traffic ticket or summons. The specific consequences can vary depending on the nature of the violation.

Using Neon Underglow Lights While Parked

Using neon underglow lights while your vehicle is parked is generally allowed in Missouri, as long as they meet the color and brightness regulations mentioned earlier.

Neon Underglow Lights on Motorcycles

The same regulations and restrictions apply to motorcycles in Missouri. They can use neon underglow lights as long as they follow the guidelines, including color restrictions and non-distracting use.


Missouri’s neon underglow laws permit the use of these eye-catching aftermarket lights with some crucial limitations. Ensuring that your neon underglow lights comply with the state’s color, distraction, and installation guidelines is essential to enjoy this automotive accessory legally. Before installing neon underglow lights on your vehicle, be sure to review and understand the applicable regulations to stay on the right side of the law.

Missouri Underglow law references:

Missouri Revised Statutes, Chapter 307: Vehicle Equipment Regulations

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