• Neon underglow lights are not allowed in some jurisdictions.neon lights image by MAXFX from Fotolia.com
  
  Neon underglow lights are an automotive modification that puts lights on the undercarriage of a car or motorcycle. While this can create a cool and noticeable effect, these modifications are often strictly controlled if they're allowed on a given state's roads at all. Check with your local DMV to find out what is and isn't allowed in your area.
  
  

Color

• In jurisdictions where neon underglow lights aren't prohibited, typically the colors of the lights are regulated. This is especially true in the case of red lights according to findlaw.com, which are prohibited in Kansas and other states. The logic behind this is that red is typically associated with police and fire vehicles as well as with ambulances, and there shouldn't be any confusion because of a ground effects kit installed on a civilian vehicle.
  
  

Tickets

• If a car has neon underglow lights, and those lights are outside of the vehicle code, then the owner of the vehicle can be ticketed as punishment for breaking the law. The variations on vehicle codes concerning neon underglow lights vary by state, county and even municipality. This is why it's so important that you check the codes where you'll be driving your car before you make a modification to the undercarriage that could land you in a lot of trouble.
  
  

Rarity

• Undercarriage neon is mostly prohibited. The law in Kansas that allows underglow neon lights in colors that aren't red is actually fairly unusual. There are also laws regarding both motorcycles as well as four-wheeler vehicles, and these codes might vary between each other, as well as by state and local codes. To check your local and state laws, call your Department of Motor Vehicles and ask what the laws are regarding neon underglow.