Ensure that the outside left and right side flat mirrors are properly adjusted so that you can see _______ bus lengths behind the bus.

Proper adjustment of the outside left and right side flat mirrors is essential for ensuring safety while operating a school bus. The goal is to have a clear view of the area directly beside and slightly behind the bus. Adjusting the mirrors to see approximately four bus lengths behind the vehicle allows the driver to effectively monitor the traffic conditions behind and to the sides, which is crucial in preventing accidents during maneuvers such as turns or lane changes.

When mirrors are set to this standard, it provides the operator with a wider field of view and helps in recognizing any potential hazards that might be present at a greater distance, ensuring optimal situational awareness. This practice contributes significantly to the overall safety of the school bus and its passengers, as it allows the driver to respond appropriately to obstacles, pedestrians, or other vehicles that might enter their path.