How far in advance must a driver signal their intention to change lanes?

A driver must signal their intention to change lanes at least 100 feet in advance. This distance ensures that other drivers have adequate time to notice the signal and react accordingly, promoting safety on the road. When a driver uses turn signals or indicators well ahead of the lane change, it minimizes the risk of accidents by clearly communicating their intended movement to surrounding vehicles. This practice of signaling allows for smoother traffic flow and helps maintain awareness among all drivers in the vicinity, which is crucial in busy or fast-paced driving environments.