CDL Cheat Sheet 2026

The 30 highest-yield CDL facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. You do not have to stop, but you must slow down and carefully check for other vehicles at → Crossings marked as exempt or abandoned
2. WHAT TYPE OF VEHICLES CAN GET STUCK ON A RAILROAD-HIGHWAY CROSSING? → Low slung units, single-axle tractors pulling a long trailer
3. If your vehicle is equipped with a cargo lift, you need to ________. → Explain how it should be checked for correct operation.
4. Avoid using the parking brakes when ________. → The brakes are very hot.
5. When you do a walk-around inspection of a coupled combination, you should especially check that the safety latch on the kingpin release arm is: → In place over the release handle (locked position)
6. How many versions of the Class A Pre-trip Inspection test exist? → Four.
7. If you are checking the trailer emergency brakes what is the first thing you should ensure? → The trailer air brake system is charged.
8. WHEN CONDUCTING A PRE-TRIP INSPECTION OF THE STEERING SYSTEM, YOU WOULD NOT INSPECT: → Leaking shock absorbers
9. WHEN BACKING TO A DOCK, WHICH OF THE FOLLOWING IS NOT TRUE? → Back slowly until you bump the dock
10. Which hazard class covers radioactive materials? → Class 7
11. What should you do with the converter dolly's air tank drain before coupling in cold weather? → Drain any water to prevent the brakes from freezing
12. Which of the following is a good indicator that you are driving your bus too fast for a banked curve? → If your bus leans toward the outside on a banked curve.
13. How many feet behind the school bus should a bus driver be able to see through his outside left side flat mirror? → 200 ft.
14. Which of the following is NOT a possible distraction to you while you are driving a commercial vehicle? → Be tested to see if you know when your vehicle is safe to drive.
15. All versions of the Class A Pre-trip inspection test will include _______. → All of the listed answers.
16. What does this sign instruct? → Keep going in the same direction. You cannot turn here.
17. This sign with black 'X' lettering identifies what? → A railroad crossing.
18. Which class of hazardous materials includes gases such as compressed or liquefied gases? → Class 2
19. What does this yellow diamond shaped sign with black symbols indicate? → Approaching a 4-way intersection.
20. Where should placards be displayed if you are required to use them? → On both ends and both sides of the vehicle
21. If your privilege to operate your personal vehicle is revoked because of alcohol, you will _______. → Lose your CDL for 1 year.
22. What device will keep air in the tanks if the air compressor develops a leak? → The one way check valve
23. The ________ are mounted directly above the windshields on driver's side of buses. → Overhead inside rearview mirrors.
24. What is the main purpose of the hazardous materials regulations? → To contain the material, communicate the risk, and ensure safe drivers
25. If you discover a fire while you are transporting hazardous materials and the trailer doors feel hot, you should ______. → Not open the doors.
26. You will be denied or lose your hazardous materials endorsement, if you _______. → All of the listed answers.
27. After completing the final run of the day, what must a school bus driver do before leaving the vehicle? → Check tire pressure and fluid levels
28. What is required when fueling a vehicle carrying hazardous materials? → Someone must control the fuel nozzle and no smoking is allowed
29. What does this white rectangular sign with black symbols indicate? → If you park here, your vehicle will be towed.
30. A placard with the word 'DANGEROUS' may be used for what? → Two or more Table 2 materials loaded at different locations