You may not drive a light motor vehicle or motorcycle on a public road unless it is fitted with stop lamps at the rear. When in use, they must emit a red light, which must be greater than that of the light emitted by the rear lamps and must be visible in normal sunlight at a distance of 30 metres to a person of normal eyesight.
A person may not drive a heavy motor vehicle on a public road unless it is fitted with at least one stop lamp on each side at the rear of the motor vehicle which shall, when in use, emit a red light and the intensity of which shall be greater than that of the light emitted by the rear lamp on the motor vehicle and shall be visible in normal sunlight at a distance of not less than 30 metres to a person of normal eyesight.
When a stop lamp is illuminated, this indicates that the vehicle is decreasing speed and may stop.