What must vehicles do when entering a traffic circle?

When entering a traffic circle, vehicles are required to yield to those already in the intersection. This rule is crucial for maintaining a smooth flow of traffic and ensuring safety. Vehicles already circulating in the traffic circle have the right of way, which helps to prevent collisions and allows for an orderly transition into the circle for entering drivers.

Yielding means giving way before merging into the circle, thus allowing vehicles already on the road to continue moving unhindered. This practice reduces the likelihood of accidents and helps manage the often complex dynamics of traffic flow within roundabouts or traffic circles.

In contrast, accelerating to merge quickly, stopping before entering, or making U-turns at the entry point could lead to confusion and dangerous situations among drivers. Such actions can disrupt the established movement patterns, leading to increased risks of accidents. Therefore, yielding is the safest and most effective procedure when approaching a traffic circle.