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Posts published in “CDL General Knowledge Practice Tests”


The Free CDL General Knowledge Practice Tests developed by CDL Digest each contain 50 multiple choice questions to help you pass the actual test on the first attempt. The CDL General Knowledge Test is required for all commercial learner’s permit (CLP) applicants. You must have a score of 80% (40 out of 50 questions) or better to pass.

General Knowledge Practice Test 1

General Knowledge Practice Test 2


Each Free CDL General Knowledge Practice Test covers knowledge of the 20 areas for safe operation of a commercial motor vehicle (CMV) as required by Federal Regulation (49 CFR 383.111(a)). It also covers commercial driver specific information contained in the following federal regulations:

49 CFR 391: Qualification of Drivers and Combination Vehicles

49 CFR 392: Driving of Commercial Motor Vehicles

49 CFR 393: Parts and Accessories Necessary for Safe Operation

49 CFR 395: Hours of Service

49 CFR 396: Inspection, Repair, and Maintenance

49 CFR 397: Transportation of Hazardous Materials, Driving and Parking Rules

The CDL General Knowledge Testing information for testing purposes can also be found in AAMVA’s “2005 CDL Test System (July 2010 or newer Version) Model Commercial Driver Manual”, which is made available at no cost at all 50 State Driver Licensing Agencies.

Section 1 of the CDL Manual covers the following CDL General Information Topics:

Commercial Learner’s Permit (CLP) and Commercial Driver License (CDL) Tests

Medical Requirements

Driver Disqualifications

Other Safety Rules and Regulations

International Registration Programs

Section 2 of the CDL Manual covers the following Safe Driving Topics:

Vehicle Inspection

Basic Control of Your Vehicle

Shifting Gears



Space Management

Controlling Speed

Seeing Hazards

Distracted Driving

Aggressive Drivers and Road Rage

Night Driving

Driver Fatigue

Driving in Fog

Winter Driving

Driving in Hot Weather

Railroad-Highway Crossings

Mountain Driving

Driving Emergencies

Antilock Braking Systems (ABS)

Skid Control and Recovery

Accident Procedures


Alcohol, Drugs, and Driving

Hazardous Materials Rules for all Drivers

Section 3 of the CDL Manual covers the following Safe Cargo Transportation Topics:

Inspecting Cargo

Cargo Weight and Balance

Cargo Securement

Cargo needing Special Attention

The source material used by CDL Digest to develop these practice test questions is very technical. It may be necessary for you to take the Free CDL General Knowledge Practice Tests several times to make sure you have a thorough understanding of all the material before taking the actual test at your State Driver Licensing Agency.