The **clearance lights** are important to indicate the **total width of the vehicle**. These lights are placed on the outer edges and at the highest part of the vehicle to ensure they are visible. They are used in the same situations as the position lights.


It is mandatory for certain vehicles, such as cars, trailers, and semi-trailers that are more than 2.10 meters wide, to have them. For vehicles that measure between 1.80 and 2.10 meters wide, their use is optional.

The vehicle lights, including the clearance lights, must be turned on **between sunset and sunrise**. During this time, it is necessary to have the appropriate lights on to ensure visibility and safety on the road. During the day, the lights are only turned on in specific conditions, such as dark days or when passing through tunnels. Therefore, the correct answer is that the clearance lights should be used between sunset and sunrise.