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The CDL general knowledge test is required to be taken by all CDL applicants. The Colorado CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the Colorado CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual CO general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. Older trailers do not have spring brakes. If the air supply leaks away:
there will be no emergency brakes.
the trailer will stop normally.
the ABS won't work properly.
All of the above.
2. Stab braking cannot be used in vehicles with:
air brakes.
anti-lock brakes.
spring brakes.
parking brakes.
3. Too much weight on the steering axle can cause:
poor traction.
hard steering and damage to the steering axle and tires.
better handling.
None of the above.
4. When crossing railroad tracks, you should:
shift gears while crossing the tracks.
try to pass slower vehicles.
not stop.
put the transmission in Neutral.
5. Which of these can cause your vehicle to skid?
Braking any harder than necessary on slippery roads
Over acceleration
Over steering
All of the above.
6. When steering to avoid a crash, you should:
not turn any more than needed to clear the hazard.
accelerate and steer at the same time.
apply the brake while you are turning.
lock your wheels while turning.
7. Warnings on low bridges or underpasses:
are often posted, but sometimes they are not.
must be posted.
are always posted.
None of the above.
8. You should downshift:
before starting down a hill or entering a curve.
before starting up a hill.
before exiting a curve.
None of the above.
9. When you are driving you should look at least ______ ahead.
12 to 15 seconds
6 to 12 seconds
5 to 10 seconds
20 to 30 seconds
10. When approaching an emergency vehicle stopped on the side of the road with lights flashing, you should:
speed up.
stay in the right lane.
yielding the right-of-way by coming to a complete stop.
move to the lane not next to that of the emergency vehicle.
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CO CDL Knowledge Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
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