A vehicle must have its clearance light on if it measures...
Lighting
The clearance lights are mandatory for vehicles that exceed 2.10 meters in width, as their function is to indicate the total width of the vehicle to improve road safety.
Explanation
**Clearance lights** are important to indicate the **total width** of a vehicle. These lights are placed on the outer edges and at the highest part of the vehicle to ensure visibility. They are mandatory for vehicles that are **more than 2.10 meters wide**. This includes cars, trailers, and semi-trailers. If a vehicle has a width between 1.80 and 2.10 meters, the use of these lights is optional.
Therefore, a vehicle must have the clearance light on if it is **more than 2.10 meters wide**, which makes the first option correct.
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