Which of the following should you do when approaching a roundabout?

When approaching a roundabout, it is essential to yield to the traffic that is already circulating within the roundabout. This is important for safety and to maintain the flow of traffic. Yielding allows you to merge smoothly into the roundabout when there is a safe gap, helping to reduce potential conflicts and accidents.

Traffic in the roundabout has the right of way, and failing to yield can lead to dangerous situations, as vehicles moving within the roundabout will not expect incoming traffic. This practice is a critical aspect of roundabout navigation and contributes to the overall efficiency of roundabouts as they are designed to facilitate continuous movement.

The other options do not align with safe practices at roundabouts. Accelerating to merge quickly can create hazardous conditions, using high-beam headlights is unnecessary for this scenario and can blind other drivers, and signaling right when going straight may confuse other drivers about your intended exit. Thus, yielding is the best practice when approaching a roundabout.