Do You Need a Third Brake Light?: 1 Minute to Understand the Importance of a Third Brake Light

A third brake light, often called a center high mount stop lamp (CHMSL), is an additional brake light located at the rear center of a vehicle, typically higher than the left and right brake lights. It’s designed to improve visibility to drivers behind you, especially in heavy traffic or poor weather conditions. In the United States, third brake lights have been federally mandated on new passenger cars since 1986 and on light trucks, vans, and SUVs since 1994. If your vehicle was manufactured after these dates, having a functioning third brake light is a legal requirement, and a broken or missing one could result in a traffic citation. For vehicles made before these regulations, a third brake light is not mandatory, yet adding one is considered a smart safety upgrade, as it helps prevent rear-end collisions by providing an additional warning signal to following drivers.

Tips 1:

As a designer, I always consider how lighting can improve both the function and safety of a space—this applies just as much to vehicles. Ensuring that your vehicle’s third brake light is visible, unobstructed, and well-integrated into the car’s design not only complies with legal standards but also enhances overall safety for everyone on the road. If you’re evaluating your car’s lighting layout, the same attention to layered, purposeful lighting used in home designer projects can be applied to your vehicle—think of each light as part of a balanced system working together for both style and utility.

FAQ

Q: Is a third brake light required on all vehicles?

A: It is required by law in the U.S. for passenger cars manufactured after 1986 and for light trucks/SUVs after 1994. Older vehicles are exempt but may benefit from having one installed.

Q: Can I get a ticket for a broken third brake light?

A: Yes, for vehicles where a third brake light is mandatory, non-functioning or missing lights can result in traffic citations.

Q: Why was the third brake light introduced?

A: Studies showed that a higher, center-mounted brake light makes stopping intentions more visible to following drivers, reducing rear-end collisions.

Q: Does the third brake light need to be red?

A: Yes, regulations require the third brake light to emit a red light consistent with other brake lamps.

Q: Can I install a third brake light myself?

A: Aftermarket third brake lights are available and can be installed with basic tools, though it’s essential to follow safety and wiring guidelines for proper operation.