What should you always do before changing lanes?

Answer: B — Check your mirrors and blind spots

Before changing lanes, it is essential to check your mirrors and blind spots. This practice helps ensure that you have a clear view of the area around your vehicle, allowing you to see if any other drivers, cyclists, or obstacles are present that could pose a risk during the lane change. By checking your mirrors, you take stock of vehicles that may be approaching from behind or occupying the lanes you intend to enter. Additionally, looking into your blind spots is crucial since mirrors alone don't provide a complete picture of surrounding traffic, particularly in areas that are not visible to you. This thorough check promotes safety and reduces the chance of collisions. Engaging in this habit not only helps prevent accidents but also makes you a more responsible and defensive driver, as it reflects your awareness of the traffic environment before making any maneuvers.