If a driver on the right-hand side of the road intends to turn left, what should they do?

When a driver on the right-hand side of the road intends to turn left, the correct approach is to watch traffic, signal their intention, and align their vehicle with the center line. This sequence of actions is vital for ensuring safety and proper communication with other road users.

Watching traffic is essential because it allows the driver to assess any potential hazards, such as oncoming vehicles or pedestrians, that could affect the turn. Signaling is crucial as it informs other drivers of the driver's intentions well in advance, promoting smoother traffic flow and reducing the risk of misunderstandings. Finally, aligning the vehicle with the center line prepares the driver for the actual maneuver, ensuring they are positioned correctly to execute the left turn safely.

In contrast, the other options lack important safety protocols. Turning without signaling can confuse other drivers and lead to accidents, while waiting in place until safe is impractical and can create unnecessary delays. Proceeding without caution disregards the need for awareness and assessment of a situation before making a maneuver, increasing the risk of collisions. Therefore, the chosen response encapsulates the best practices for making a left turn safely.