What is the minimum number of brake lights required on passenger cars?

Passenger vehicles are required to have a minimum of two brake lights. This requirement is in place to ensure visibility and safety on the road. When a driver applies the brakes, the brake lights illuminate, signaling to other drivers that the vehicle is slowing down or coming to a stop. Having at least two brake lights provides a clearer indication of braking for following vehicles, which helps prevent rear-end collisions and enhances overall road safety.

In many jurisdictions, including Hawaii, the standard for having two brake lights is established to ensure that even if one brake light fails, there will still be at least one operational light, thereby maintaining a level of safety. This redundancy is crucial, especially in low visibility conditions such as at night or in inclement weather.