A curve’s posted speed is guaranteed to be safe for a bus whenever it is safe for a passenger car.
Correct answer: B – FALSE
Arizona’s CDL manual warns that a posted curve speed may be safe for cars but too high for many buses. A bus may roll over when traction is good or slide from the roadway when traction is poor. The driver must reduce speed appropriately before entering the curve rather than treating the posted speed as a guaranteed safe bus speed.
Source: Arizona Commercial Driver License Manual — § 4.3.4, “Speed on Curves”

