What should be done when approaching a roundabout?

When approaching a roundabout, yielding to traffic already in the roundabout is essential for maintaining smooth flow and safety. Roundabouts are designed to allow vehicles to flow continuously, reducing the likelihood of accidents compared to traditional intersections. By yielding, drivers can ensure that they merge safely into the ongoing traffic. This practice helps prevent collisions and promotes an orderly transition into the roundabout.

The other options suggest actions that could lead to unsafe situations. Speeding up to merge can create conflicts with vehicles already in the roundabout, while entering without yielding could lead to accidents. Stopping before entering, regardless of traffic, could cause unnecessary delays and disrupt the flow of vehicles behind you. Thus, yielding to the traffic already in the roundabout is the correct and safest approach.