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Colorado CDL General Knowledge Test 9 2025

Perfect for first-time and renewal CDL/CLP applicants, and those adding endorsements.

Updated for December 2025, this Colorado General Knowledge practice test contains another 50 questions based on the official CDL (Commercial Driver’s License) manual. You can use this test to prepare for the General Knowledge portion of the CO CDL exam. These questions are multiple-choice, with three possible answers for each question. Only one of those answers is correct. If you’re not sure about the correct answer, you can use the hint provided for each question. Each hint points you to the correct answer without giving away the correct answer itself. This should allow you to make an informed decision about the correct answer, even if you don’t actually know it. There is no time limit for completing this practice test. Every time you answer a question, you’ll get immediate feedback with a detailed explanation, so you won’t need to wait until the end of the test to know the correct answers.

Real exam-style pitfalls you’ll practice:
Common Traps
Distractors
Trick Wording
Double Negatives
Colorado CDL General Knowledge Test 9 2025
Commercial Driver's License
Based on official CO exam questions
Steven Litvintchouk, M.S., Chief Educational Researcher at Driving-Tests.org

Authored and fact-checked by Steven Litvintchouk, M.S.

Chief Educational Researcher, Driving‑Tests.org (ACES member)
Last verified for accuracy on
Methodology & Editorial Policy

9 min to complete
Available in EN and ES

What to expect on the actual CO permit test

50

questions

40

correct answers to pass

80%

passing score

Real Colorado drivers who passed first try

Verified student reviews • Shared with permission

Thanks to Driving-Tests.
Org I passed all tests 95 and above. I love driving a school bus! I'm Very happy!
J
Walked in and did General knowledge, air brake, doubles,.
I walked in and did General knowledge, air brake, doubles, triples, tanker, hazmat, school bus and passenger. I did it all on the same day, and I passed with a 97 or 98% something like that. So I was very well prepared and passed the test with ease.
K
Fast and efficient way to prepare for the exam.
Read the CDL manual, then started to re-read more intensely. But, then I came across driving-tests.org. In one afternoon I learned much more than I would have by just re-reading the manual. This was much more efficient and made me comfortable that I can pass any test.
JIC
Best place to get ready for anything cdl.
This hazmat elite training was great for Ms here in colorado I used to for the hazmat elite and for class a and I passed both with ease. My hazmat test at the dmv basically was all the questions from practice test 4 so thank you guys for the great course
J
Using Driving-tests.org made it super simple to study.
I spent maybe 10 hours answering questions. The marathons questions really solidified my knowledge. I definitely did not need to read the handbook. I think I missed 5 on the general knowledge. I missed three on the air brakes and 1 on the combination vehicles. I was able to complete all 3 tests in less than 40 minutes. The agent administering the test was surprised at how quickly I completed the test. She said they have people from trucking schools that spend hours taking the test and most do not pass the first time.
C

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