What is the signal a driver must give before turning or changing lanes?

Answer: C — At least 100 feet

A driver must signal their intention to turn or change lanes at least 100 feet before executing the maneuver. This requirement ensures that other drivers, pedestrians, and cyclists have adequate time to react to the driver's intended movement, thus promoting safety on the road. By providing this advance notice, the driver allows others to adjust their own speed or position, reducing the likelihood of collisions and enhancing overall traffic flow. This distance is designed to create a clear line of communication between drivers, which is particularly important in busy or complex driving environments.