Question Header boards: Answers Should never be used. Protect the driver from being hit by cargo. Protect the driver's head when entering the cab of a truck. Explanation Front-end header boards, also known as "headache racks," protect the driver from cargo moving in the event of a crash or emergency stop. This questions appears in the following tests: Arkansas Class B Knowledge Test Idaho Class B Knowledge Test Idaho Class B Knowledge Test Iowa Class B Knowledge Test Minnesota Class B Knowledge Test Oregon Class A Knowledge Test Virginia Class B Knowledge Test