What is the function of the high-mounted stop lamp?

[BellaAnn]

The function of the high-mounted stop lamp is to warn vehicles behind to avoid rear-end collisions. The high-mounted stop lamp is generally installed on the upper part of the rear of the vehicle. For vehicles without high-mounted stop lamps, especially low-chassis sedans and mini cars, the rear stop lamps are positioned relatively low and often lack sufficient brightness. Drivers of following vehicles, particularly those in high-chassis trucks, buses, and coaches, may sometimes have difficulty seeing them clearly. High-mounted stop lamps can be categorized by material into gas high-mounted stop lamps and LED high-mounted stop lamps. By bulb base type, they are classified as W5W and W16W.