How can you check if your blind spots are clear before changing lanes?

Answer: C — Look over your shoulder in the direction you intend to move

Looking over your shoulder in the direction you intend to move is crucial for checking blind spots before changing lanes. This action allows you to directly see any vehicles or obstacles that may not be visible in your mirrors. While mirrors provide valuable information about what is behind and beside your vehicle, they do not fully eliminate blind spots. By physically turning your head, you can gain a clear view of areas that mirrors might miss, ensuring that it is safe to change lanes. This practice is especially important in avoiding accidents, as blind spots often conceal vehicles that are traveling in adjacent lanes. Utilizing the other methods, such as checking rearview mirrors or side mirrors, can complement this action, but they cannot replace the need to look over your shoulder. Signal lights are important for indicating your intentions to other drivers but do not assist in checking for vehicles in your blind spots.