What is the minimum tread depth required on school bus snow tires used in lieu of tire traction devices?

The minimum tread depth required on school bus snow tires used in lieu of tire traction devices is 6/32 of an inch. This requirement is established to ensure adequate traction during winter conditions, which is crucial for the safety of school pupils being transported. Tires with a sufficient tread depth provide better grip on slippery surfaces, such as snow and ice.

Using tires with a depth of less than 6/32 may significantly increase the risk of skidding or losing control of the bus, thereby endangering the safety of the passengers. This standard reflects a balance between safety and performance needed for vehicles operating in adverse weather conditions common during winter months.