Before changing lanes, what must you always do?

Before changing lanes, it is essential to signal, check the rear view mirror, and check blind spots. Signaling your intention is necessary to alert other drivers of your maneuver; it is a crucial part of safe driving. Checking the rear view mirror allows you to see vehicles that may be behind you, ensuring you're aware of traffic approaching from the rear. Additionally, checking blind spots is vital because there are areas around your vehicle that may not be visible in your mirrors. This step helps to ensure that there are no vehicles, cyclists, or pedestrians in your blind spots that could pose a danger when you change lanes. By performing all these actions together, you significantly increase your safety and the safety of others on the road when making a lane change.