What should you do to check your blind spot before changing lanes?

To effectively check your blind spot before changing lanes, it is essential to look over your shoulder in the direction you plan to move. This physical action ensures you have a clear view of the area that is not visible in your mirrors. Mirrors only provide a partial view of your surroundings, and a considerable area to the side and behind your vehicle can be obscured from sight. By turning your head and looking over your shoulder, you can spot vehicles or hazards that may be in your blind spot, ensuring it is safe to change lanes.

This practice is crucial for safe driving, as it helps prevent accidents by allowing you to verify the presence of other road users who may not be visible through your mirrors alone.