What must you do after using your turn signal before changing lanes?

Before changing lanes, it is essential to check your mirrors and blind spots after using your turn signal. This step ensures that you are fully aware of your surroundings and can identify any vehicles or obstacles that might be present in the lane you intend to move into. This practice helps prevent accidents and promotes safe driving habits by ensuring that you have clear visibility around you.

Using your turn signal indicates your intention to change lanes, but that alone is not sufficient for safe maneuvering. Checking mirrors allows you to see vehicles behind you and the next lane over, while looking over your shoulder to check blind spots ensures you have accounted for any vehicles that may not be visible in your mirrors. This comprehensive approach to lane changing enhances safety on the road and is a critical part of defensive driving practices.