In a traffic circle, who must yield?

In a traffic circle, the vehicle on the right has the right of way. This means that if you're approaching the circle and there's a vehicle to your right already in the circle, you must yield to that vehicle. The concept behind this rule is to maintain smooth traffic flow and minimize the risk of collisions. When multiple vehicles approach the circle, this right-of-way rule helps to clarify which vehicle should proceed, thus improving safety and efficiency in navigating the intersection.

The other options might suggest yielding rules that are not typically enforced in traffic circles. For example, the vehicle approaching the intersection does not automatically yield, as it depends on whether there are vehicles already in the circle. The notion of yielding to the left or determining priority based on the size of the vehicle also does not align with standard traffic laws or practices in traffic circles. Understanding this right-of-way principle is essential for anyone driving in or around roundabouts and traffic circles.