What is the function of a car's high-mounted brake light?

[IsabelaAnn]

The function of a car's high-mounted brake light is to alert vehicles behind, thereby preventing rear-end collisions. The high-mounted brake light is generally installed at the upper part of the rear of the vehicle, making it easier for following vehicles to notice when the front vehicle brakes, thus helping to avoid rear-end accidents. Since most cars already have two brake lights installed at the left and right ends of the rear, the high-mounted brake light is also referred to as the third brake light, high-mounted stop lamp, or third stop lamp. Vehicles without a high-mounted brake light, especially low-chassis cars and microcars, may have rear brake lights that are positioned too low and often not bright enough. This can make it difficult for drivers of following vehicles, particularly those in taller vehicles like trucks, buses, and coaches, to see clearly, increasing the risk of rear-end collisions.