What should motorcyclists do when approaching a roundabout?

When approaching a roundabout, motorcyclists should slow down and yield to circulating traffic. This is important because roundabouts are designed to improve traffic flow and safety by allowing vehicles to navigate intersections without the need for stoplights or stop signs.

By slowing down, motorcyclists can safely assess the situation and determine whether it is appropriate to enter the roundabout. Yielding to circulating traffic ensures that they do not interfere with vehicles that are already traveling within the roundabout, which helps prevent collisions and maintain a smooth flow of traffic.

The other options are less suitable, as speeding up can pose a danger by introducing the risk of not being able to react to other vehicles or changing traffic conditions. Stopping completely, while it may seem cautious, can disrupt the flow of traffic and increase the likelihood of accidents, as vehicles behind may not anticipate the sudden stop. Making a U-turn is also not appropriate when approaching a roundabout, as it contradicts the intended flow and use of the roundabout.