What must you always do before changing lanes?

Before changing lanes, it is essential to check your mirrors and blind spots to ensure that it is safe to do so. This practice helps you become aware of any vehicles or obstacles that may be in your vicinity, particularly in areas that are not visible in your mirrors. By thoroughly checking mirrors and blind spots, you can make informed decisions and reduce the risk of collisions or accidents when merging into a different lane.

Being vigilant in your observation not only ensures your safety but also the safety of other road users. It's important to remember that relying solely on one method of awareness—such as just using mirrors or signaling—can be insufficient, as there may be vehicles or cyclists that you cannot see without physically checking your blind spots. Therefore, this thorough approach is vital for maintaining road safety.