Which of these is not a mandatory light on a vehicle?
Lighting
Explanation
The **external position light** is not a regulatory light on a vehicle, unlike the other options mentioned.
- The **reverse light** is a regulatory light. It is used to illuminate the road from the rear of the vehicle and to warn that the vehicle is going to move backward. It is mandatory for all cars, except for motorcycles, and optional for three-wheeled vehicles and heavy quadricycles.
- The **emergency signal light** is not mentioned in the provided excerpts, but it is a regulatory light used to indicate emergency or danger situations on the road.
Therefore, the **external position light** is not considered a regulatory light on vehicles according to the information provided.
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