What item must be activated indicating you are changing lanes?

The proper item to activate when changing lanes is the turn signal. Using a turn signal is essential because it communicates your intention to other drivers on the road. This helps maintain safety and reduces the risk of accidents, as it gives other motorists time to react to your movements.

The turn signal alerts surrounding traffic that you plan to alter your direction, which is particularly important in busy driving scenarios where multiple vehicles are present. Proper use of turn signals is not merely a legal requirement but also a critical practice for safe driving.

In comparison, brake lights are used to indicate that you are slowing down or stopping, headlights are primarily for visibility at night or in adverse weather conditions, and hazard lights signal a temporary traffic hazard or when a vehicle is in distress. None of these serve the specific purpose of notifying others about a lane change, making the turn signal the correct and necessary choice.