During braking, which wheel condition gives a bus more traction?
Correct answer: B – The wheels continue rolling instead of locking
Rolling wheels have more traction than locked wheels. Excessive braking can lock the rear wheels, causing them to slide sideways as they attempt to catch up with the front wheels. A bus or straight truck may then spin out. Controlled braking that keeps the wheels rolling helps the driver retain directional control.
Source: Commercial Driver License Manual — § 2.19.1, “Drive-Wheel Skids”

