What should a driver do if they encounter a pedestrian in a marked crosswalk?

A driver should always yield to pedestrians within a marked crosswalk to ensure their safety. This rule is established to protect pedestrians, as they may not be as visible or quick-moving as vehicles. Marked crosswalks are designated areas that indicate where pedestrians have the right to cross, and yielding in these areas is crucial to preventing accidents and promoting safe road use.

Yielding not only complies with traffic laws but also demonstrates consideration for pedestrians' safety and rights. By stopping for pedestrians, drivers help create a safer environment for all road users, reducing the risk of injury or fatality in pedestrian-related incidents.

The other options do not prioritize the safety of the pedestrian. Speeding up or honking can create confusion or lead to accidents, while simply waiting for the pedestrian to cross without yielding may not comply with the legal obligation to stop. Thus, yielding in a marked crosswalk is the most responsible and correct action to take.