Who must yield in a four-way stop?

In a four-way stop situation, it is important to understand the right-of-way rules to ensure safe and efficient traffic flow. The correct choice states that the driver who arrives last must yield to those who arrived first. This rule is foundational to traffic regulations at intersections controlled by stop signs.

When multiple vehicles arrive at a four-way stop, the vehicles that have already stopped have the right-of-way over those that are still in motion. If a driver approaches the intersection after another vehicle has already stopped, they must yield to that vehicle to avoid collisions and ensure the intersection operates smoothly. This principle helps maintain order and safety on the roads, preventing confusion and the potential for accidents.

Other choices indicate that factors like the size of the vehicle or the timing of horn honking influence who must yield, but in reality, the critical factor is the order of arrival at the stop. The rule solely revolves around the sequential arrival of vehicles, which makes it clear that the last arriving vehicle must yield to those already present at the stop.