The **reverse gear** is a maneuver that is only allowed in specific situations, such as when parking or when it is not possible to move forward, for example, on a street blocked by construction. During this maneuver, the driver must ensure that there is no danger to other drivers or pedestrians and must stop if any risky situation arises.

Regarding the **use of the seat belt**, drivers are exempt from wearing it fastened when performing the reverse gear maneuver. This is because, in these situations, the driver may need to move freely to have better visibility and control of the vehicle when looking backward. Therefore, the correct answer is that **yes, they are exempt** from using the seat belt when reversing.