Question If driving a truck that requires a CDL for operation: 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 are always required to wear a seat belt. You are only required to wear a seat belt when driving a tank trailer. Explanation For safety, you must wear your seat belt at all times while operating a CMV. This questions appears in the following tests: Connecticut Class A Knowledge Test Florida Class A Knowledge Test Indiana Class A Knowledge Test Indiana Class A Knowledge Test Kansas Class A Knowledge Test New York Class B Knowledge Test New York Class B Knowledge Test Oregon Class A Knowledge Test Pennsylvania Class B Knowledge Test South Dakota Class A Knowledge Test Texas Class B Knowledge Test West Virginia Class A Knowledge Test Wisconsin Class A Knowledge Test Wyoming Class B Knowledge Test