What should you do when entering a roundabout?

When entering a roundabout, yielding to traffic that is already in the roundabout is crucial for ensuring a smooth and safe flow of vehicles. Vehicles circulating in the roundabout have the right-of-way, so it is important to slow down and assess the situation before proceeding. This practice minimizes the chances of collisions and helps maintain the efficiency of traffic movement.

Entering without stopping, as suggested by one of the other options, can lead to dangerous situations as it may disrupt the flow of traffic already inside the roundabout. Speeding up to enter quickly can also pose a risk, as it may lead to misjudging gaps in traffic, resulting in potential accidents. Additionally, signaling left when approaching a roundabout could confuse other drivers about your intentions, especially since most drivers would expect an indication of exiting the roundabout instead. Therefore, yielding to traffic is the correct and safest action to take.