Which method helps the driver communicate their intention to change lanes?

Using turn signals is the correct method for a driver to communicate their intention to change lanes. Turn signals provide a clear, visual indication of a driver's upcoming maneuver, which is essential for maintaining safety on the road. By signaling, the driver informs other road users, including vehicles and pedestrians, of their desire to change lanes, allowing everyone to anticipate their movements and adjust accordingly.

This practice is crucial for preventing accidents, as it enhances awareness and promotes cooperation among drivers. Effective communication through turn signals helps to create a more predictable driving environment, reducing the chances of misunderstandings on the road.

The other methods mentioned do not serve this purpose. Backing up can create confusion, honking the horn is generally used to alert others rather than signal a lane change, and accelerating may indicate an intention to pass but does not specifically communicate a lane change.