In which situation must a driver yield the right-of-way?

A driver must yield the right-of-way to pedestrians crossing at a marked crosswalk to ensure their safety. This requirement is enforced to protect pedestrians, who may have the right-of-way based on the law, allowing them to cross the street safely. Drivers should always be vigilant and prepared to stop when approaching a crosswalk where pedestrians are present. This practice helps prevent accidents and promotes a safer driving environment for everyone.

In contrast, approaching a green traffic signal does not require yielding to other vehicles, as it indicates that drivers can proceed unless there is an imminent hazard. In a roundabout, vehicles already in the roundabout typically have the right-of-way over vehicles entering, but this scenario doesn't apply universally to all situations. Lastly, while a vehicle with a yield sign must yield the right-of-way, this situation pertains to that specific vehicle rather than a general requirement for all drivers.