If a driver intends to turn in the direction indicated by a yellow arrow, what is their first responsibility?

When a driver sees a yellow arrow, it serves as a warning that they should prepare to yield or stop before making the turn. The yellow arrow indicates that the light is about to change to red, and it is crucial for the driver to assess the situation before proceeding. The driver's first responsibility is to ensure their safety and the safety of others by being prepared to stop if necessary. This approach allows the driver to evaluate oncoming traffic, pedestrians, or other potential hazards before making the turn.

The other options involve actions that are either premature or may compromise safety. Proceeding with caution might not be enough if traffic signals are about to change. Signaling their intention to turn is indeed important, but it should come after confirming that it is safe to do so. Making the turn quickly could lead to dangerous situations if the driver does not properly assess the traffic conditions.