What is the minimum tread depth for commercial tires on a vehicle?

The minimum tread depth requirement for commercial tires is vital for maintaining adequate traction and handling, especially in various road conditions. The correct answer indicates that steering tires must have a minimum tread depth of 4/32 of an inch, while other tires only require 2/32 of an inch.

This regulation is in place because steering tires play a crucial role in vehicle control and safety. A greater tread depth on steering tires helps ensure better grip on the road, which is essential for maneuverability and stability while driving. Tires with insufficient tread depth, particularly those at or below 4/32 of an inch on the steering axle, can lead to hydroplaning during wet conditions and can significantly impair the vehicle's response to steering inputs.

On the other hand, the minimum requirement of 2/32 of an inch for the other tires is sufficient as these do not directly influence steering as much. However, it is still important for traction, especially during braking and driving on wet or slippery surfaces. Thus, option B reflects the guidelines established for maintaining safety and performance standards for commercial vehicles.