Question Emergency equipment, such as fire extinguishers, are: Answers Only needed in vehicles transporting hazardous materials. Only needed for interstate travel. Required in all commercial motor vehicles. Explanation All commercial motor vehicles must carry appropriate emergency equipment, including fire extinguishers. This questions appears in the following tests: Alaska Class B Knowledge Test Arizona Class B Knowledge Test Arkansas Passenger Kentucky Class A Knowledge Test Missouri Class B Knowledge Test Missouri Tank New Mexico Passenger South Carolina Tank Virginia Class B Knowledge Test Virginia Passenger