What should you do when you encounter a roundabout?

Yielding to traffic already in the roundabout is the correct approach because roundabouts are designed to keep traffic flowing smoothly and reduce the likelihood of collisions. When you approach a roundabout, it is important to understand that vehicles within the roundabout have the right of way. By yielding, you allow those already in the roundabout to pass before you enter, thereby maintaining the continuous flow of traffic and decreasing congestion. This principle helps ensure safety for all road users, including pedestrians and cyclists, as they navigate their way around the circle.

The other options misrepresent the proper way to navigate a roundabout, which can lead to unsafe driving practices. For instance, speeding up to enter could create hazardous situations, while stopping at the entrance disrupts the continuous flow and can lead to rear-end collisions. Making a left turn to exit is also incorrect, as you should simply continue counter-clockwise around the roundabout and exit at the desired exit point, instead of making a turn as you would at an intersection. Understanding the proper etiquette for roundabouts is essential for safe and efficient driving.