Texas Commercial Driver’s Licenses (CDL)

In 2026, the landscape for Texas Commercial Driver’s Licenses (CDL) is more competitive and regulated than ever. With the full implementation of federal ELDT (Entry-Level Driver Training) and Texas-specific "Special Requirements," aspiring truckers must master the Texas CDL Handbook to succeed.

This elite SEO guide—tailored for the modern driver—features the top 30 questions you’ll face at the DPS, including the mandatory "Commercial Rules" section that many fail.

The 2026 Texas CDL Exam Blueprint
To get your CLP (Commercial Learner's Permit) in Texas, you must pass two main written components before any endorsements:

Texas Commercial Rules (Special Requirements): 20 questions (must pass this first).

General Knowledge: 50 questions (the core exam).

Important: As of 2026, all first-time Class A and B applicants must be registered in the FMCSA Training Provider Registry after completing ELDT theory training before they can sit for their skills test.

Part 1: Texas Special Requirements (Section 14)
Texas requires specific knowledge of state laws found in Section 14 of the handbook. You must pass this with an 80% to move forward.

1. During the day, if your load extends more than 4 feet beyond the rear of the vehicle, what must you attach to the end?

Answer: A 12-inch square red flag.

2. At night, what must be attached to a load extending more than 4 feet beyond the rear?

Answer: A red light visible for at least 500 feet.

3. What is the maximum width allowed for any vehicle on Texas highways?

Answer: 102 inches.

4. When operated at night, farm tractors must have a rear white light or two red reflectors visible from:

Answer: 1,000 feet.

5. Every truck or bus 80 inches or more in width must carry what emergency equipment?

Answer: Three flares, three red electric lanterns, or three red emergency reflectors.

6. When following another truck on the highway, what is the legal following distance?

Answer: You must keep far enough back to allow another vehicle to overtake and enter the space between you safely.

7. On a vehicle 80 inches or more in width, reflectors must be mounted at what height?

Answer: Between 24 and 60 inches from the ground.

8. What is the maximum speed limit for any commercial motor vehicle on a rural interstate in Texas (unless otherwise posted)?

Answer: 70 mph.

9. When are you required to use "Slow Moving Vehicle" (SMV) emblems?

Answer: On all vehicles designed to operate at speeds of 25 mph or less.

10. If you are hauling a load that exceeds legal limits (length, width, or weight), what must you obtain?

Answer: A special permit from the Texas Department of Transportation (TxDOT).

Part 2: CDL General Knowledge (2026 Edition)
11. What is the most important reason for doing a vehicle inspection?

Answer: Safety for yourself and other road users.

12. What is the minimum tread depth required for front tires?

Answer: 4/32-inch. (All other tires require 2/32-inch).

13. What is the primary purpose of a "Retarder" (Jake Brake)?

Answer: To help slow the vehicle and reduce brake wear.

14. What should you do if your vehicle begins to hydroplane?

Answer: Release the accelerator and push in the clutch; do not use the brakes.

15. How far ahead should a commercial driver look while driving?

Answer: 12 to 15 seconds (about a quarter-mile at highway speeds).

16. What is "Stab Braking"?

Answer: Applying the brakes all the way, releasing when the wheels lock, and re-applying when they start rolling again.

17. What is the legal BAC limit for CDL holders in Texas?

Answer: 0.04%.

18. Why should you use a helper when backing a commercial vehicle?

Answer: Because every commercial vehicle has "blind spots" you cannot see.

19. What should you do if you are being tailgated?

Answer: Increase your following distance in front of you.

20. What are the three types of inspections required by law?

Answer: Pre-trip, En-route, and Post-trip (DVIR).

21. At what PSI should the low air pressure warning light/buzzer come on?

Answer: Before the pressure drops below 60 PSI.

22. If your vehicle catches fire, where should you NOT aim the fire extinguisher?

Answer: Into the engine compartment through the hood (the oxygen will feed the fire). Aim through the louvers or from underneath.

23. What is the "Danger Zone" around a bus?

Answer: The area extending 10 feet around all sides of the bus.

24. When driving in very hot weather, how often should you check your tires?

Answer: Every 2 hours or every 100 miles.

25. What causes "Brake Fade"?

Answer: Excessive heat buildup, usually from using the brakes too much on a long downgrade.

26. How do you test the Hydraulic Leaks?

Answer: Pump the brake pedal three times, then apply firm pressure for 5 seconds. The pedal should not move.

27. What is "Off-tracking"?

Answer: When the rear wheels follow a different path than the front wheels during a turn.

28. Why should you never use the trailer hand valve to park?

Answer: If the air leaks out, the trailer could roll away.

29. What is the first thing you should do if you have a tire blowout?

Answer: Hold the steering wheel firmly and stay off the brakes.

30. When must you notify your employer of a traffic conviction?

Answer: Within 30 days of the conviction.

Essential Texas CDL Resources
Official Texas CDL Handbook (Section 14): Your Bible for the exam.

Texas DPS Appointment Scheduler: Mandatory for all written and skills tests in 2026.

ELDT Training Provider Registry: Verify your school is certified before paying.
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