Why is it crucial to check blind spots before changing lanes?

It is crucial to check blind spots before changing lanes because this action helps ensure that there are no vehicles or obstacles present in the areas that are not visible in your mirrors. Blind spots are the zones to the sides and rear of your vehicle where other vehicles may be lurking but cannot be seen through standard mirrors. By physically turning your head and checking these areas, you gain a clear view of your surroundings, allowing you to make safer lane changes and reduce the risk of collisions. This practice promotes awareness of nearby traffic, ensuring a safer driving experience for both you and other road users.

The other options relate to vehicle operation and comfort but do not address the critical safety concern associated with blind spots. Adjusting your seat or maintaining a distance from the steering wheel pertain to driver ergonomics rather than situational awareness. Similarly, determining fuel efficiency is unrelated to the immediate task of changing lanes and does not contribute to safe driving practices.