Which wheel condition provides better traction during bus braking?
Correct answer: B. – The wheels continuing to roll without locking
Rolling wheels retain more traction than locked wheels. When rear drive wheels lock during braking, they can slide sideways as they try to catch up with the front of the vehicle. A bus or straight truck may spin out. Controlled braking keeps the wheels rolling while applying as much braking force as conditions safely allow.
Source: Georgia Commercial Driver's Study Guide — § 2.19.1, “Drive-Wheel Skids”

