What is the importance of checking blind spots before lane changes?

Answer: B — To prevent collisions with vehicles in the driver’s blind zones

The importance of checking blind spots before lane changes is primarily to prevent collisions with vehicles that may be located in areas not visible through the vehicle's mirrors. Blind spots refer to the zones around a vehicle where a driver cannot see, typically due to the vehicle's structure, size, or other obstructions. By looking over their shoulder and ensuring these areas are clear, drivers can safely make lane changes, avoiding accidents with cars, motorcycles, or cyclists in those blind zones. Other options, such as ensuring passengers are seated, determining traffic speed, or assessing weather conditions, while important for overall safe driving, do not directly relate to the specific need for checking blind spots when changing lanes. It is critical for a driver to be aware of all surrounding vehicles to operate a bus safely and maintain the safety of both passengers and other road users.