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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. Vehicle inspections:
are required by state and federal law.
should only be performed by a certified mechanic.
are required once a month.
are not required for trips under 50 miles.
2. A red triangle with an orange center means:
The vehicle is hauling hazardous materials
Law enforcement vehicle
Liquid tanker
Slow-moving vehicle
3. To calculate how much space you should keep in front of you:
count off the seconds until you reach the vehicle ahead.
add 4 seconds for each 10 feet of vehicle length at speeds below 40 mph.
count off the seconds until you pass a pavement marking, or some other clear landmark.
count off the seconds from when the vehicle ahead of you passes some clear landmark to when you reach that same landmark.
4. In which of the following situations should you check your mirrors more often?
While stopped at an intersection.
When driving on a single lane road.
When changing lanes or merging.
When driving on a narrow road.
5. To check the signal lights, do the following:
Turn off all the lights, turn on the stop lights, and turn on the left turn signal lights.
Turn off all the lights, turn on the right turn signal lights, and turn on the stop lights.
Turn on the stop lights, turn on all the lights, and turn on the right turn signal lights.
Turn on all the lights, turn off the stop lights, and turn off the left turn signal lights.
6. You need to pay special attention to the space below your vehicle:
in no passing zones.
in school zones.
on dirt roads.
on multi-lane roads.
7. It is important to shift gears correctly to keep:
the engine warm.
the engine cool.
control of the vehicle.
the engine oil flowing.
8. Class 1 hazardous materials include:
Radioactive materials
Flammable liquids
Flammable solids
9. Which of the following vehicles can be operated without a CDL?
Farm vehicles operated by a farmer within 150 miles of the person's farm.
CMVs operated by military personnel for military purposes.
Snowplows operated during declared emergency snow removal operations.
All of the above.
10. You are driving on a two-lane road. If an oncoming driver has drifted into your lane:
you should brake as hard as you can.
you should downshift.
a move to your left is best.
a move to your right is best.
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CO CDL Practice Test

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