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HOW DO I FIND SPECIFIC INFORMATION FOR Iowa?
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We are including the following links to information that is specific to Iowa.
We try to include all available official links, however the State of Iowa often
change their webpages and/or the addressing of those webpages. We constantly
update these links, but from time to time they are not available due to recent
changes. If you are having problems with any of these links, try typing "Iowa Official Website" into your Google, Bing or Yahoo search engine and you
should be able to find your "starting point" on their website. You should be
able to find the Commercial Drivers License information by typing in "CDL" into
their internal search (if available) or by following the Drivers License Services
links within their website. This is a great source of Iowa regulations,
forms, locations, contacts, etc.
Quickly Access Official Iowa CDL Information
Access to official web pages maintained
by the State of Iowa
Iowa CDL (commercial driver's license) License Fees
- Class A (commercial) Two years min. - Five to eight years max. $8 per year
- Class B (commercial) Two years min. - Five to eight years max. $8 per year
- Class C (commercial) Two years min. - Five to eight years max. $8 per year
- Double/Triple trailers $5
- Passenger $10
- Tank vehicles $5
- Hazardous materials* $5*
- School bus $10
- Remove air brake restriction $10
*The hazardous material endorsement fee must be paid every time a CDL is renewed. The hazardous material knowledge examination is also required.
Iowa CDL Written Knowledge Tests
You will need to pass the
Iowa Knowledge Tests that are required for
the class of license, restriction, and endorsements you wish to possess. A general
knowledge test for the Class A or Class B and C license must be successfully completed
by all CDL applicants. The information needed to pass these tests is contained
in the
FREE Iowa CDL Handbook. Please read and study this
manual carefully.
- Class A - 70 Questions (50 GK + 20 Combination Vehicles) - Skills test required.
- Class B - 50 Questions - Skills test required.
- Class C - 50 Questions - Skills test required for bus, school bus and air
brakes vehicles..
- Passenger Endorsement - 20 questions - Skills test required in bus.
- School Bus Endorsement - 25 questions - Skills test required in school bus.
- Doubles/Triples Endorsement - 20 questions - No additional skills tests.
- Tank Vehicle Endorsement - 20 questions - No additional skills tests.
- Hazardous Materials Endorsement - 30 questions - No additional skills tests.
- Air Brake Restriction Removal - 25 questions - Additional skills test in vehicle with Air Brakes.
Classes of Iowa CDL and Required Tests
| CDL Class |
Tests Required |
Possible Endorsements and Required Tests |
Class A
(Combination
vehicle endorsement required) |
General Knowledge Written Exam
Combination Endorsement Written Exam
Road Exam |
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| Class B |
General Knowledge Written Exam
Road Exam |
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| Class C |
General Knowledge Written Exam
Road Exam
Note: If upgrading to a Class C from a Class D, no road test is required UNLESS the endorsement requires one. |
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Iowa CDL Endorsements
| Exam |
Time Allowed (Minutes) |
# of Questions on Exam |
# of Correct Answers Needed to Pass |
| General Knowledge |
60 |
50 |
40 |
| Air Brakes |
25 |
25 |
20 |
| HazMat |
30 |
30 |
24 |
| Tank |
20 |
20 |
16 |
| Passenger |
20 |
20 |
16 |
| Doubles/Triples |
20 |
20 |
16 |
| Combination Vehicles |
20 |
20 |
16 |
| School Bus |
20 |
20 |
16 |
Access Official Federal CDL General Information
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WHAT KIND OF QUESTIONS ARE ASKED ON THE CDL WRITTEN EXAMS?
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A tiny sampling of questions from each of the written CDL exams follows . . .
GENERAL KNOWLEDGE EXAM (Required for ALL CDL's)
Steering tires must have a tread depth of at least . . .
A. 2/32 inch.
B. 3/32 inch.
C. 4/32 inch.
D. 5/32 inch.
When driving on wet roads, you should reduce your speed by . . .
A. half the distance from the vehicle in front of you.
B. 1/3.
C. 1/2.
D. 2/3.
You're performing your pre-trip inspection for your CDL test. Where should your ignition key be?
A. In the ignition.
B. In your pocket.
C. With your logbook.
D. In the cab.
TRANSPORTING PASSENGERS, (P) ENDORSEMENT
You must stop at least how far from a drawbridge, if there is no traffic light or attendant?
A. 10 feet.
B. 20 feet.
C. 50 feet.
D. 100 feet.
When stopping for railroad tracks, you must stop no closer than 15 feet before the nearest track.
A. True.
B. False.
AIR BRAKES ENDORSEMENT
The air leakage rate for a combination vehicle with the engine off and the brakes applied should be no more than . . .
A. 1 psi in 15 seconds.
B. 3 psi in one minute.
C. 4 psi in one minute.
D. allowed at lower altitudes.
You "put on the brakes" by . . .
A. pushing down on the brake pedal.
B. pushing down on the foot valve.
C. pushing down on the treadle valve.
D. all of the above.
COMBINATION VEHICLES (Req'd by ALL Class A's)
Every combination vehicle with air brakes has two air lines, the service line and the return line.
A. True.
B. False.
How much visible space should be between the upper and lower fifth wheel plates?
A. None.
B. At least 1/4 inch.
C. No more than 1/2 inch.
D. Approximately 1 inch.
DOUBLES AND TRIPLES, (T) ENDORSEMENT
Driving conditions are good. A 100 foot long combination vehicle traveling at 35 MPH would need how much safe following distance?
A. 8/10 of a minute.
B. 10 seconds.
C. 11 seconds.
D. Two vehicle lengths.
Triple trailers are legal in your State of Residence.
A. True.
B. False.
TANK VEHICLES, (N) ENDORSEMENT
Because liquids expand and contract under different temperatures . . .
A. you must be familiar with the difference between bulkheads and baffles.
B. you must know the outage requirements.
C. you must be prepared for possible surge.
D. you must have a HAZ MAT placard in place.
Bulkheads in a tank and baffles in a tank are the same.
A. True.
B. False.
HAZARDOUS MATERIALS, (H) ENDORSEMENT
The driver may keep hazardous materials shipping papers . . .
A. behind the left side HAZ MAT placard.
B. in a pouch on the drivers door or on the driver's seat when out of the vehicle.
C. with the shipper until acceptance at the destination.
D. in a secure place that is locked.
What is the minimum distance from a Class 3 (flammable liquids) or Division 2.1 (gases) placarded cargo tank that you may smoke or carry a lighted cigarette, cigar, or pipe?
A. 10 meters.
B. 25 feet.
C. 100 feet
D. 300 feet.
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There is a total of 670 questions on the actual Iowa CDL Course tests, which covers the entire POOL of questions used on the actual CDL examinations. Questions on your ACTUAL TESTS will come from this POOL of questions. Each "CLASS" of CDL and each "ENDORSEMENT" is covered in a separate section. You are required to take only those exams that apply to your driving requirements. The Iowa CDL Course includes complete "self testing" practice tests and "self scoring" BLANK and CORRECT answer sheets.
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