What action should a driver take when encountering a roundabout?

When encountering a roundabout, the appropriate action for a driver is to yield to traffic that is already in the roundabout and signal when exiting. This is important because vehicles within the roundabout have the right of way, which ensures a smooth flow of traffic and minimizes the risk of collisions. Yielding allows drivers to assess the situation and merge safely into the circular path without disrupting the movement of others.

Additionally, signaling when exiting is crucial for informing other drivers of your intentions, helping to maintain safety and awareness for everyone involved. By signaling, you alert vehicles around you and any pedestrians who may be crossing at the exits.

The other options present actions that do not align with safe driving practices at roundabouts. For instance, speeding up to merge with oncoming traffic can lead to dangerous situations, and signaling incorrectly while entering and exiting does not provide accurate communication to other drivers. Ignoring signs altogether undermines road safety and can create hazardous conditions. Thus, yielding and signaling effectively are key components of navigating roundabouts correctly.