What is the minimum tire tread depth required for the steering axle (front) of a bus?

The minimum tire tread depth required for the steering axle (front) of a bus is indeed 4/32 inches. This depth is critical for ensuring adequate traction, stability, and handling of the vehicle, especially during various road conditions and in wet weather. Tread depth is essential for the effectiveness of tire performance, as it directly impacts the tire's ability to grip the road surface.

When the tread depth is at or above 4/32 inches, the tire can channel water away from the contact patch, reducing the risk of hydroplaning and enhancing overall safety for passengers. Insufficient tread depth can lead to decreased control over the bus, particularly in adverse conditions, which emphasizes the importance of regular tire maintenance and checks.

In contrast, the other options reflect tread depths that fall below the legal minimum standards set for the steering axle of a bus. Having less than 4/32 inches of tread may compromise safety and handling, making it imperative for drivers and maintenance personnel to monitor tire conditions closely.