How can you tell if a roundabout is approaching?

Recognizing that a roundabout is approaching is crucial for safe driving. The correct choice involves looking for signs that specifically indicate the presence of a roundabout or circular intersections. These signs are strategically placed to alert drivers well in advance, allowing them to prepare to navigate the roundabout safely. This advance warning helps in managing speed and positioning within the lane before entering the roundabout.

The other options may provide hints about other types of road changes, but they do not serve the same clear, specific purpose. For example, a flashing yellow light might indicate caution but doesn’t necessarily mean a roundabout is ahead. Changing street names could occur for various reasons that aren't directly related to approaching a roundabout, and while roads can become narrower as they approach intersections, this is not a guaranteed sign of a roundabout. Hence, identifying proper road signs is the most reliable method for anticipating a roundabout.