Question Header boards: Answers Should never be used. Protect drivers from being hit by cargo. Protect drivers' heads when they are entering the cab of a truck. Explanation A header board protects a driver from moving cargo in the event of a crash or emergency stop. Take a FREE Practice Test Now This questions appears in the following tests: Hawaii Knowledge Test Class A , Idaho Knowledge Test Class A , Ohio Knowledge Test Class A , South Dakota Knowledge Test Class A , Missouri Knowledge Test Class B ,