Within how many hours must a driver stop when an emergency vehicle with flashing lights approaches?

The correct choice emphasizes the need for drivers to take immediate action when an emergency vehicle with flashing lights approaches. The law generally requires that drivers yield the right of way to emergency vehicles, which includes stopping their vehicle or pulling over to the side of the roadway as soon as it is safe to do so. This prompt response helps ensure the safety of emergency responders and allows them to take necessary actions without delay.

Responding immediately is crucial, as any delay could impede emergency services from reaching those in need or hinder their ability to navigate traffic effectively. This is why the law specifies that drivers must act without hesitation when they see an emergency vehicle approaching with flashing lights.

The options involving time considerations, such as stopping within a specific number of seconds or waiting for a period, do not align with the requirement for an immediate response, as situations can vary widely and every second counts in emergencies.