Artikel 15

1. From nightfall and during the night, or when atmospheric conditions render it necessary, every vehicle or combination of vehicles on a road shall show at least one white light in front and at least one red light in the rear.
When a vehicle, other than a cycle or a motor-cycle without sidecar, is provided with only one white light in front, this shall be placed on the side nearest to traffic coming from the opposite direction.
In countries where two white front lights are obligatory, such lights shall be placed one on the right and one on the left of the vehicle.
The red light may be produced either by a device distinct from that which produces the white light or lights in front or by the same device when the vehicle is short enough and so arranged as to permit this.
2. In no case shall a vehicle have a red light or a red reflector directed to the front or a white light or a white reflector directed to the rear. This provision shall not apply to a white or yellow reversing light in cases where the domestic legislation of the country of registration of the vehicle permits such lights.
3. Lights and reflex reflectors shall be such as to ensure that the vehicle is clearly indicated to other road users.
4. Any Contracting State or subdivision thereof may, provided that all measures are taken to guarantee normal conditions of safety, exempt from certain provisions of this article:
(a) vehicles used for special purposes or under special conditions,
(b) vehicles of special shape and kind,
(c) stationary vehicles on adequately lighted roads.