Final answer:
The statement is false; drivers must generally yield to pedestrians even without a marked crosswalk to ensure pedestrian safety and reduce accidents.
Step-by-step explanation:
The statement that a driver must yield to a pedestrian only when a crosswalk is marked is false. Drivers are generally required to yield to pedestrians crossing the road, regardless of whether there is a marked crosswalk. This is to ensure pedestrian safety, especially in areas where there is significant foot traffic, like near a school campus. In situations without a traffic signal, pedestrians often have to navigate through traffic, which raises safety concerns and increases the risk of accidents. Thus, traffic signals are beneficial as they control the flow of both vehicles and pedestrians, ensuring that pedestrians can cross at designated times without having to dodge traffic, thereby reducing the likelihood of incidents.