Translation guide
A tail lamp is a red light at the rear of a vehicle, used to signal presence, braking, or turning. In Japanese, the most common term is テールランプ, but other words exist depending on context.
The red light on the back of a car, motorcycle, or bicycle that is always on when headlights are on.
The most common and general term for 'tail lamp' in Japanese. Used for cars, motorcycles, and other vehicles.
The tail lamp is out.
A more technical or formal term, often used in vehicle regulations or manuals.
Refers to the entire rear light assembly, which may include tail lamp, brake lamp, and turn signal. Often used in car parts contexts.
Replace the rear lamp assembly.
The red light that brightens when the brake is applied.
The red light on the back of a bicycle, often battery-powered.
テールランプ is the everyday word. 尾灯 is formal and often appears in legal texts. リアランプ refers to the whole rear light cluster, including turn signals and brake lights.
For bicycles, テールライト is very common. 尾灯 is also correct but sounds more official.
The tail lamp must be red.
At night, the tail lamp must be turned on.