Question When operating a truck requiring a CDL: Answers You are never required to wear a seat belt. You are required to wear a seat belt, but only if transporting more than 500 pounds of cargo. You must always wear a seat belt. You are required to wear a seat belt, but only if you are driving a tank vehicle. Explanation A driver's seat should always be equipped with a seat belt. You must wear a seat belt at all times while operating a CMV. Take a FREE Practice Test Now This questions appears in the following tests: Nevada Knowledge Test Class B , Vermont Knowledge Test Class B ,