Which condition disqualifies tires from being used on a school bus?

Tires are critical for the safety and performance of any vehicle, especially when it comes to school buses that carry children. Each of the listed conditions represents serious safety hazards that could compromise the integrity and functionality of the tires.

Unrepaired fabric breaks can lead to tire failure, as they expose the internal structure of the tire to external conditions and stresses. This could result in blowouts, which pose a significant risk when transporting students.

Exposed or damaged cords indicate that the tire's framework is compromised. This condition can drastically reduce the tire's ability to bear weight and resist pressure, making it unsuitable for use on a school bus.

Bumps, bulges, or knots due to internal separation typically signal a severe issue with the tire's structure, often caused by impact damage or manufacturing defects. Such conditions can create points of weakness that may fail if the tire is placed under the stress of road conditions or vehicle operation.

Because all of these conditions lead to a compromised and unsafe tire, it is imperative that any tire exhibiting any of these characteristics is disqualified from use on a school bus. This stringent criteria helps ensure the safety of the children being transported.