Michigan Commercial Driver's License (CDL) Practice Exam

What is the minimum tread depth for tires other than front tires?

1. 1/32 inch

2. 2/32 inch

3. 3/32 inch

4. 4/32 inch

The correct answer is: 2/32 inch

The minimum tread depth for tires, other than the front tires, is indeed 2/32 inch. This standard is established to ensure adequate traction and handling for vehicles, particularly on wet or slippery surfaces. Maintaining the correct tread depth is crucial for safety, as insufficient tread can lead to hydroplaning and an increased risk of losing control of the vehicle, especially during adverse weather conditions. Front tires, on the other hand, serve a more critical role in steering and stopping, which is why they typically have a higher required tread depth for safety. The two-millimeter standard for non-front tires balances the need for safety with practicality, allowing for monitoring and maintenance without being too stringent on tread life. The incorrect choices reflect either industry recommendations or legal requirements that pertain to either different categories of tires or specific performance conditions that may not be directly applicable to general motor vehicle operation. In summary, recognizing the 2/32 inch requirement reinforces the importance of ensuring that all vehicles adhere to safe operational standards.