What is the minimum size for a cross-over mirror on a school bus?

The minimum size for a cross-over mirror on a school bus is established to ensure drivers have a broad and effective view of the area around the bus. A cross-over mirror, which is crucial for enhancing safety, allows the driver to monitor blind spots and prevent accidents, especially when children are entering or exiting the bus.

A size of 7 1/2 inches is necessary to provide an adequate field of vision. This dimension is designed to minimize blind spots, ensuring that the driver can see students who may be in close proximity to the bus. The larger size helps capture more of the surroundings, making it a critical safety feature in school transportation.

Given the importance of visibility in school zones and around buses, having a mirror that is too small would not meet safety requirements or effectively serve its purpose, which is why a size of 7 1/2 inches is mandated.