What is the purpose of a lane change signal?

The purpose of a lane change signal is to notify other drivers of a lane change. When a driver intends to change lanes, using a turn signal (or lane change signal) is essential for communicating their intentions to other road users. This helps to ensure safety by allowing drivers in adjacent lanes to be aware of the lane change, enabling them to adjust their speed or position if necessary.

Proper signaling is a critical part of driving etiquette and helps to prevent accidents that can occur when a driver changes lanes without warning. Drivers behind or beside the vehicle can prepare for the maneuver, reducing the risk of collisions and ensuring smoother traffic flow.

In contrast, the other options focus on different driving actions that do not correspond with the primary function of a lane change signal. Indicating a right turn only pertains specifically to turning and is not relevant to lane changes. Signaling that the vehicle is stopping relates to coming to a complete halt rather than changing lanes. Indicating a speed increase does not involve communication regarding lane adjustments on the road.