When must drivers signal a lane change?

Answer: C — At least 100 feet before changing lanes

Drivers are required to signal a lane change at least 100 feet before making the maneuver. This advanced signaling allows other drivers and pedestrians to become aware of the changing intentions of the vehicle, which enhances safety on the road. This distance provides sufficient time for surrounding drivers to react accordingly, whether that means adjusting their speed or position to accommodate the lane change. Signaling well in advance also helps to establish predictability, which is crucial in maintaining the smooth flow of traffic and minimizing potential conflicts or accidents. It serves as a communication tool among drivers, ensuring that everyone is aware of upcoming lane shifts and helping maintain a safe driving environment. While signaling is essential regardless of the presence of other vehicles, the requirement to signal a specific distance before changing lanes is a key aspect of safe driving practices.