Colorado CDL — General Knowledge Practice Test
The Colorado CDL — General Knowledge knowledge test has 50 questions, and you need 40 correct (80%) to pass. Practice free with questions written from the official Colorado driver handbook — every one has a clear explanation, and you can retake as often as you like with no sign-up.
Content reviewed against official driver handbooks · July 7, 2026
What's on the Colorado written test
The Colorado CDL — General Knowledge knowledge test has 50 questions; you need 40 correct (80%) to pass.
Based on the official Colorado exam format — always confirm current details with your state DMV.
Practice by topic
Focus on one area at a time — each topic has its own set of Colorado practice questions.
Learn the shapes, colors, and meanings of regulatory, warning, and guide signs — from stop and yield to construction and school-zone signs.
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
How to read traffic signals, lane lines, and pavement markings — including yellow and white lines, arrows, and flashing lights.
Who goes first at intersections, four-way stops, roundabouts, and crosswalks, and how to yield to pedestrians and emergency vehicles.
Following distance, scanning, blind spots, using your lights, and the habits that prevent crashes and keep you in control.
Driving safely around motorcycles, bicycles, large trucks, pedestrians, and school buses — and knowing who has the right of way.
Blood alcohol limits, zero-tolerance and implied-consent laws, and how alcohol and drugs — legal or not — affect your driving.
Legal and illegal parking, colored curbs, distances from hydrants and crossings, and how to park safely on hills.
Choosing a safe speed, keeping a space cushion, adjusting for weather and traffic, and understanding stopping distance.
What to do when things go wrong — brake failure, tire blowouts, skids, and stalling on railroad tracks.
The point system, license suspension, provisional-license rules, insurance requirements, and other licensing basics.
How to pass the first time
- Read the official Colorado driver handbook at least once before test day.
- Practice by topic to find your weak spots, then fix them.
- Take full-length practice tests until you pass comfortably every time.
- Read every explanation — understanding beats memorizing.
Colorado CDL — General Knowledge test — frequently asked questions
How many questions are on the Colorado CDL — General Knowledge test?
The Colorado CDL — General Knowledge knowledge test has 50 questions, and you need 40 correct (80%) to pass. Our practice tests mirror that format.
How many questions can I miss on the Colorado CDL — General Knowledge test?
You can miss up to 10 of the 50 questions and still pass — you need 40 correct, which is 80%.
Can I retake the practice test?
Yes — practice as often as you like, completely free. The questions and answer choices are shuffled each time.
Can I take the Colorado practice test in Spanish?
Yes. Every question here is available in English and Spanish — switch languages anytime. Many states also offer the real knowledge test in languages other than English; confirm what Colorado offers with your DMV.
Can I practice on my phone?
Yes. The practice tests work in any mobile or desktop browser — no app or sign-up needed — so you can study anywhere.
Are these the real DMV test questions?
No. Our questions are original, written from the current official Colorado driver handbook to match the real test's topics and style. We are not affiliated with any DMV or government agency.
What's the best way to study?
Read the Colorado driver handbook, practice by topic to target weak areas, and finish with full-length tests until you consistently pass.
Other Colorado practice tests
Take the CDL — General Knowledge test in another state
Every Colorado question is written from the official Colorado driver handbook and checked against its current edition. DMV Test Free is a free, independent study resource — not affiliated with any DMV or government agency. About DMV Test Free
Colorado CDL — General Knowledge questions with answers
20 sample questions from the Colorado CDL — General Knowledge question bank — each with the correct answer, a short explanation, and the section of the official handbook it comes from.
1. When flashing red lights begin at a highway-rail crossing, what must the driver do?
Correct answer: Stop and let the train go first
Flashing red lights mean a train is coming; you must stop and yield the right-of-way, and if there are several tracks make sure all are clear before crossing.
Source: Colorado CDL Manual, Section 2.15.2 (Warning Signs and Devices)
2. After you leave the traveled lane and come to a stop, particularly after dark, how should you warn other drivers?
Correct answer: Turn on your four-way emergency flashers
Turn on the four-way emergency flashers when you stop off the road; drivers have crashed into parked vehicles thinking they were still moving.
Source: Colorado CDL Manual, Section 2.5.2 (Communicating Your Presence)
3. Objects seen in a convex ('fisheye') mirror appear how, compared with looking at them directly?
Correct answer: Smaller and farther away than they really are
In a convex mirror everything looks smaller and seems farther away than it really is, so you must allow for that distortion.
Source: Colorado CDL Manual, Section 2.4.2 (Seeing to the Sides and Rear)
4. For a combination vehicle to fall in Group A and require a Class A CDL, the towed unit's gross vehicle weight rating must be more than what?
Correct answer: More than 10,000 pounds
Group A covers a combination with a GCWR of 26,001 pounds or more when the trailer or towed unit is rated over 10,000 pounds GVWR.
Source: Colorado CDL Manual, Section 1 (CDL Classifications)
5. A crossbuck sign marking a highway-rail grade crossing places what legal duty on the driver?
Correct answer: It requires you to give the right-of-way to an approaching train
The X-shaped crossbuck requires you to yield to any train using the tracks, since a train always has the right-of-way at a crossing.
Source: Colorado CDL Manual, Section 2.15.2 (Warning Signs and Devices)
6. Total stopping distance is made up of which three parts added together?
Correct answer: Perception distance, reaction distance, and braking distance
Total stopping distance equals perception distance plus reaction distance plus braking distance.
Source: Colorado CDL Manual, Section 2.6.1 (Stopping Distance)
7. During a front-wheel skid, what is the only way to stop it?
Correct answer: Let the vehicle slow down
During a front-wheel skid the nose of the vehicle keeps going straight however you steer, so the only fix is to let it slow down.
Source: Colorado CDL Manual, Section 2.19.3 (Front-wheel Skids)
8. About how much alcohol can the liver process in an hour?
Correct answer: About one-third of an ounce per hour
The liver clears only about one-third of an ounce of alcohol per hour at a fixed rate, so drinking faster than that leaves alcohol building up in the body.
Source: Colorado CDL Manual, Section 2.22.1 (Alcohol and Driving)
9. How long, at minimum, is a driver disqualified for a first out-of-service order violation?
Correct answer: At least 90 days
A first out-of-service order violation costs the CDL for at least 90 days; a second within ten years brings at least one year.
Source: Colorado CDL Manual, Section 1.3.4 (Violation of Out-of-Service Orders)
10. Where a white stop line is painted on the pavement before railroad tracks, what does it require of a stopped school bus?
Correct answer: The front of the bus must remain behind the line
The front of the school bus must stay behind the painted white stop line while it is stopped at the crossing.
Source: Colorado CDL Manual, Section 2.15.2 (Warning Signs and Devices)
11. How does road rage differ from aggressive driving, according to the manual?
Correct answer: Road rage involves the intent to harm or assault another driver
Road rage is operating a vehicle with the intent to harm others or to physically assault a driver or their vehicle, going beyond mere aggressive driving.
Source: Colorado CDL Manual, Section 2.10.1 (Aggressive Drivers/Road Rage)
12. When you make a right turn so wide that traffic could squeeze between your vehicle and the curb, how should you position the vehicle?
Correct answer: Keep the rear of the vehicle close to the curb
Hold the back end near the curb as you turn so no one can slip past on your right side.
Source: Colorado CDL Manual, Section 2.7.6 (Space for Turns)
13. When you must stop on a two-lane road, one warning device belongs about 100 feet ahead of the vehicle and another about how far behind it?
Correct answer: About 100 feet behind
On a two-way road, place one device about 100 feet behind and one about 100 feet ahead, plus one within 10 feet of the vehicle.
Source: Colorado CDL Manual, Section 2.5.2 (Communicating Your Presence)
14. The manual defines a hazard as what?
Correct answer: Any road condition or road user that could become a danger
A hazard is any road condition or road user, such as a driver, bicyclist, or pedestrian, that is a possible danger.
Source: Colorado CDL Manual, Section 2.8.1 (Importance of Seeing Hazards)
15. If an applicant passes the skills test in a vehicle with an automatic transmission, what appears on the license?
Correct answer: A restriction that prohibits driving a CMV with a manual transmission
Passing the skills test in an automatic results in an 'E' restriction barring the driver from operating a CMV with a manual transmission.
Source: Colorado CDL Manual, Section 1 (Restrictions)
16. On a two-lane road, what does a no-passing zone sign posted at a railroad crossing indicate?
Correct answer: That passing other vehicles is prohibited at the crossing
A no-passing marking and sign at a rail crossing on a two-lane road prohibit passing other vehicles in that area.
Source: Colorado CDL Manual, Section 2.15.2 (Warning Signs and Devices)
17. The manual's rule for following distance at speeds below 40 mph is what?
Correct answer: About one second per 10 feet of your vehicle's length
Below 40 mph, allow at least one second of following distance for each 10 feet of vehicle length; above 40 mph, add one more second.
Source: Colorado CDL Manual, Section 2.7.1 (Space Ahead)
18. How does an antilock braking system help the driver during hard braking?
Correct answer: It helps you keep control and steer while braking hard
ABS keeps the wheels from locking up so you can keep the vehicle under control and steer around an obstacle; it does not necessarily shorten stopping distance.
Source: Colorado CDL Manual, Section 2.18 (Anti-lock Braking Systems)
19. As blood alcohol builds up, which part of the brain is affected first?
Correct answer: The part controlling judgment and self-control
The area of the brain hit first governs judgment and self-control, which is risky because a drinker may not notice they are becoming impaired.
Source: Colorado CDL Manual, Section 2.22.1 (Alcohol and Driving)
20. What happens to a CDL after a second major offense such as a second DUI in a CMV?
Correct answer: Loss of the CDL for life
A second major offense results in loss of the CDL for life.
Source: Colorado CDL Manual, Section 1.3.2 (Alcohol, Leaving the Scene, and Felony)