Chapter 7-2 CDL Permit, License and Endorsements CDL Class Class C Test Required Possible Endorsements and Required Tests General Knowledge H - Hazardous Materials Written Exam Written Exam N - Tank Vehicles Written Exam P - Passenger Transport Written & Road Exam Road Exam Note: If upgradX - HazMat & Tank Written Exam ing to a Class C Vehicles from a Class D, L - Air Brakes Written & no road test is Road Exam required UNLESS S - School Bus Written & the endorsement Road Exam requires one. 7:7