To receive this endorsement, applicants must pass a test consisting of 20 multiple choice questions. Each question has three answer choices. To pass, the applicant must answer at least 16 questions correctly. Test questions come from the Iowa Commercial Driver License Manual. Questions come from chapters covering: Driving Safely, Transporting Passengers Safely, Pre-Trip Vehicle Inspection Test, Basic Vehicle Control Skills Test and On-Road Driving. The Passenger endorsement can be used with the Class A, B or C CDL.