Question When driving a truck requiring a CDL: Answers You do not need 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. Explanation You must be properly restrained by a safety belt at all times when driving a commercial motor vehicle. This questions appears in the following tests: Idaho Class A Knowledge Test Kentucky Class A Knowledge Test Michigan Class B Knowledge Test Minnesota Class B Knowledge Test Nevada Class B Knowledge Test New Mexico Class B Knowledge Test Rhode Island Class A Knowledge Test Washington Class B Knowledge Test