CDL Practice Test General Knowledge - Everything You Need To Know

All commercial drivers are required to pass the general knowledge test to obtain the commercial driver’s license (CDL). You will need to prove your knowledge of commercial vehicles before your state authorizes you to drive one. Similar to any test, the CDL general knowledge requires studying and proper preparation as you will be tested on diverse topics. To that effect, this article aims to elaborate on everything you need to know about the CDL practice test general knowledge essentials.


The Theory Behind The CDL Practice Test General Knowledge

The CDL general knowledge is a closed book exam. That means you need to take some time studying for your test and brush up on your testing skills. The general knowledge practice test will ensure that you:

Understand how the test is structured

The general knowledge practice test has multiple-choice queries structured in a similar format you will find on your CDL permit test. Even so, it will have an explanation for every question to help you familiarize yourself with the topic of the question. That will enable you to answer your test correctly even if it is worded a bit differently.

Learn at your own pace

Instead of cramming and trying to learn everything you need to know all at once, set a steady pace for your study. Taking the practice tests while still in the studying and learning phase can help you monitor your progress and identify areas that need re-studying.

Take surprise out of the equation

For most states, the general knowledge CDL test is a certain amount of questions, pulled from a database of hundreds of questions. By taking the multiple general knowledge practice tests, you are less likely to encounter any surprises or unexpected questions during the actual test.

Test your nerves and boost your confidence

The general knowledge test can bring a lot of pressure for many people. The pressure can consequently cause nervousness that can hinder you from doing well in the test. Taking the practice tests will not only brush up your knowledge but will also show you how well you can handle your nerves and boost your confidence when you take the real test.

What Does The CDL General Knowledge Test Involve?

The CDL general knowledge test has 50 multiple-choice questions. You are required to score at least 80 percent or answer 40 questions correctly to pass the test. Moreover, the exam comes from different topics, including:

Essential vehicle control entails understanding how to back and turn safely and handle the commercial vehicle in various driving situations.

Vehicle inspections are test questions covering the fundamental pre-trip, during the trip, and post-trip motor vehicle inspection.

CDL General Knowledge Test

Vision– this topic covers how you scan the road ahead while driving the truck. It also entails the proper use of mirrors.

The gears– the general knowledge test will also assess your understanding of when and how to shift gears properly in all driving scenarios while using automatic and manual transmissions.

The following distance–space management covers the importance of keeping a safe distance around you.

Communication– the topic tests your communication skills with other drivers. It would be best to understand when to communicate your intentions using turn signals, headlights, brake lights, 4-way flashers, and the horn.

Distractions– the test assesses your knowledge of how you can identify distracted drivers and how you can avoid becoming distracted yourself. You should also know how to deal with aggressive drivers and road rage.

Necessary hazardous materials– all commercial drivers must understand the hazardous materials irrespective of your CDL classification. Hence, you will be tested on hazard identification, hazmat basics, and the procedures you follow to respond when these hazards become emergencies.

Speed control– the general knowledge test will cover the posted speed limits on highway gradients and how to control the vehicle speed in curves, slopes, and climbing lanes.

Railroad crossings– you must recognize the different rail crossing types, when the rules require you to stop, and how to drive across the rails safely.

ABS– the test gauges your understanding of how antilock brake systems can impact your driving and ways of ensuring the ABS is functioning correctly.

Night and fog driving ensure you can deal with low visibility conditions and procedures for safe night driving.

Driving in hot or winter weather– you should be able to define black ice and understand how to drive in snow. You must also recognize slippery pavement, remove the cap or radiator and drive with hot tires.

Fires– understand how to respond to vehicle fires appropriately and learn the type of fire extinguishers required for commercial vehicles.

Accident procedures– the test will cover ways to can respond to accidents whether you are stopping to assist other drivers or you are the one involved.

Skid control and recovery– you should learn the different types of skids and how to prevent and recover from them properly.

Who Can Take the CDL Knowledge Test?

The commercial motor vehicle safety act, 1986 stipulates the minimum requirements that have to be met before one is issued with a CDL in the United States. It also specifies who should take the CDL general knowledge test. That includes:

Class A drivers

That entail drivers who would wish to drive vehicles with a gross vehicle weight of 26,000 pounds and over. These are vehicles like tractor-trailers, tanker vehicles, flatbeds, and track and trailer combinations.

Class B drivers

This CDL license is required to operate any vehicle that isn’t hitched to a trailer. The drivers can drive in furniture delivery, auto-transport driving, and cement production sectors. That will typically include buses and dump, tow, distributing, or garbage trucks.

Class C drivers

That entails a single or combination of vehicles that don’t meet the definition of class A or B but is designed to transport over 16 passengers.

Eliminate the Stress of Your General Knowledge Written Test with Confidence!

Authentic Test Questions to Mimic Real-Life Situations

As you prepare for your real General Knowledge test, maximize your revision and take advantage of practice tests to ensure success. Our site at offers up-to-date, reliable exams that accurately mimic the actual exam content – so it’s like a dry run! Taking our free practice tests is simple and straightforward, giving you an excellent chance to pass with flying colors on the first try!

Outperforming The Driver's Handbook

In this space, we offer ample practice tests to help you diagnose your knowledge gaps. Once identified, you can use these as a guide and continue revising until you’re ready for the CDL General Knowledge written test with confidence!

Why You Should Pick Us Above the Rest?

Taking time to study and practice the CDL general knowledge test is essential in ensuring you are better prepared for the real test. At, we strive to place you in the right direction to start your exciting trucking career. We offer you free; real-exam replicas CDL test practice to prepare you for your commercial driver’s license program. With practice, you will develop this essential skill, pass the CDL test, and drive competently for years to come.

An Enormous Collection of Data

Are you up for the challenge? Our extensive question bank has been skillfully crafted with over 120 questions, so that your knowledge is tested and rewarded each time! Prepare to embark on an intellectual journey of discovery where prizes await.

Sign-up Free!

Realizing how tedious it can be to complete a lengthy registration form, we've made the process as easy and convenient as possible. Signing up with us is fast and simple - no need for complex paperwork!

Curious about CDL questions?

Our meticulous imitation examinations replicate the genuine exam, allowing you to confidently gear up for your assessment. We provide realistic CDL-related questions so that you can guarantee a successful outcome!


The CDL General Knowledge Test is required for all United States commercial drivers. It covers basic knowledge of operating a commercial vehicle and ensuring you know its rules and regulations. The CDL General Knowledge Practice Test is an important step to obtaining your CDL license. The test consists of multiple-choice questions on traffic signs and signals, vehicle inspection, hazardous materials, air brakes, and essential cargo weight and size knowledge.

The test includes questions about traffic laws, vehicle system operation, state regulations for CDLs, and other topics. The test is divided into sections based on subject matter to ensure adequate topic coverage. You must pass all areas of the CDL General Knowledge Test to obtain your CDL.

There are several ways to prepare for the CDL General Knowledge Test. Taking a CDL practice test is one of the best ways to familiarize yourself with the content and format of the actual test. Additionally, you should review CDL study materials to ensure that you are well informed on the topics that will be covered. Finally, practice proper CDL driving techniques to ensure you are prepared for the road tests you must pass to obtain your CDL.

The CDL General Knowledge Test can be challenging. To help you stay focused, create a study schedule and stick to it. Additionally, break down the material into manageable chunks so you can focus on one topic at a time. Try using CDL practice tests to test your knowledge and identify areas where you need more review. Finally, take regular breaks to keep your mind sharp and maximize your study time.

You should receive your results immediately after completing your test.

The General Knowledge Test requires a passing score of 80% or higher to obtain your CDL. Make sure you are well prepared for the test so that you can pass on your first attempt.

If you fail, you must wait a certain amount before you can retake the test. The waiting period varies by state and is typically 14 days or more. You must also pay an additional fee for each attempt.

You can usually schedule the CDL Test at your local Department of Motor Vehicles (DMV). Make sure to check with your state’s DMV for specific instructions. Additionally, you must provide proof of identity and payment before taking the test.

It is typically taken at the DMV or a testing facility approved by your state. Check with your local DMV for where and when to take the test.