Taillights

Taillights are rear-facing lighting assemblies on motor vehicles that help other road users see a vehicle at night and in low-visibility conditions. They typically illuminate whenever the vehicle's headlights are on, providing a baseline level of rear visibility. When the driver applies the brakes, brake lights intensify to warn following traffic of a decelerating or stopped vehicle. Many taillight units also include turn signals or other indicators.

Modern taillight assemblies may combine several functions in one housing: tail lights, brake lights, turn signals, rear fog lights, and reversing lights. They can use a single integrated unit or multiple lenses spread across the rear of the vehicle. Lighting technology has progressed from incandescent bulbs to LEDs, which offer faster response, longer life, and lower energy use. In some premium designs, micro-LED or OLED elements are used. Regulations in different regions specify color, brightness, placement, and visibility requirements; taillights are typically red, rear turn signals often amber, with variations by jurisdiction.

History began with early gas or oil lamps and evolved to electric incandescent taillamps in the early 20th century, with LEDs widely adopted in the late 20th and early 21st centuries. Maintenance involves checking for burned-out bulbs, ensuring seals prevent moisture ingress, and keeping lenses clear for maximum brightness. Proper operation of rear lighting is mandated by law in most jurisdictions because faulty taillights can reduce nighttime visibility and increase the risk of collisions.