What is a common indication of a driver preparing to turn left?

The correct response is that a driver preparing to turn left typically extends their left arm straight out. This hand signal is universally recognized as a way for drivers to communicate their intention to other road users, particularly when visibility may be limited or when they are not using turn signals. Extending the left arm indicates a left turn is planned, allowing both pedestrians and other motorists to anticipate the maneuver.

Using arm signals is particularly important for ensuring safety on the road, as it helps convey intentions clearly in situations where other forms of signaling might not be visible or effective. This practice reinforces the social compact of road use, where drivers share the responsibility of communicating their movements to minimize confusion and accidents.