Colorado CDL Practice Test 2025 - Free Commercial Driver’s License Practice Questions and Study Guide

The correct choice is based on safety regulations concerning the condition of tires on a bus. A bus must have tires that provide adequate traction and handling, especially on the front wheels where steering and stability are crucial. Re-grooved, recapped, or retreated tires can be legally utilized as long as they comply with safety standards. These modified tires can extend the life of the tire while maintaining appropriate safety dimensions and tread depth for safe operation.

New tires are often recommended, but they are not the only option permissible for the front wheels, and there are specific regulations that allow re-grooved, recapped, or retreated tires under defined conditions. Using used tires without any modification can lead to safety concerns, particularly if they do not meet the required tread depth or structural integrity. Flat tires are clearly unsuitable for any vehicle operation, especially on the front wheels, as they cannot function effectively at all.