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CDL Practice Test : Free Exam Questions & Study Guide
The Commercial Driver's License (CDL) exam is the federally mandated gateway for anyone seeking to operate large, heavy, or hazardous material vehicles in the United States. Whether you are aiming for a Class A license to drive tractor-trailers across the country, a Class B for dump trucks and buses, or a Class C for specialized transport, passing the General Knowledge test and specific endorsement exams is mandatory. The road to becoming a professional driver starts with mastering regulations, safety protocols, and vehicle systems.
Our comprehensive CDL practice test suite covers all major endorsements and the core General Knowledge exam. Updated for , these questions simulate the actual DMV testing experience, covering critical topics like air brakes, combination vehicles, hazardous materials, and pre-trip inspections. Use this guide to identify your weak spots, understand the federal requirements, and walk into the DMV with the confidence to pass on your first attempt.
Important: The CDL General Knowledge test is required for all license classes (A, B, and C). Air Brakes and Combination Vehicles exams are mandatory for most Class A licenses.
Free CDL Practice Tests
Select a specific CDL endorsement or the general knowledge test below to begin your practice. These questions mirror the actual DMV exam format.
CDL General Knowledge
Free CDL Practice Test covering traffic laws with CDL Answers and comprehensive CDL Test Online access for commercial driver licensing preparation.
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CDL Air Brakes
CDL Practice featuring brake systems CDL Questions with Free CDL Test access and air pressure inspection protocols for endorsement qualification.
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CDL Combination Vehicles
CDL Exam covering tractor-trailer coupling with CDL Online access and CDL Test Practice for articulated vehicle operation safety standards.
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CDL Doubles & Triples
CDL Test Online featuring multiple trailer handling with Free CDL Practice and connection procedures for long combination vehicle endorsement.
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CDL Tanker Endorsement
Free CDL Practice Test covering liquid surge with CDL Practice Test Free access and bulk transportation safety for tanker vehicle certification.
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CDL HazMat Endorsement
CDL Practice Exam featuring hazardous materials regulations with CDL With Answers and placarding requirements for dangerous goods transportation.
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CDL Passenger Transport
CDL Mock Test covering passenger safety with CDL Sample questions and emergency evacuation procedures for bus operator endorsement certification.
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CDL School Bus
CDL Online Exam featuring student loading zones with CDL Test Questions and railroad crossing protocols for school bus driver endorsement.
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Quick review of essential CDL concepts and regulations.
📏What is the minimum tread depth for front tires?
Front steering tires must have at least 4/32 inch tread depth. All other tires must have at least 2/32 inch.
CDL Inspection Quiz🛣️What is the rule for following distance?
One second for every 10 feet of vehicle length at speeds under 40 mph. Add one second for speeds over 40 mph.
CDL Safety Quiz🛑What is brake lag distance?
The distance the vehicle travels from the time you push the brake pedal until the brakes actually start applying.
CDL Air Brakes Quiz⚠️Where do you place emergency triangles?
On a two-lane road, place them 10 feet, 100 feet, and 200 feet toward approaching traffic.
CDL Hazards Quiz🚛How high can mud flaps be off the ground?
Generally, mud flaps should not be more than 8 inches from the surface of the road to prevent debris spray.
CDL Equipment Quiz🍺What is the BAC limit for CDL drivers?
It is illegal to operate a commercial motor vehicle with a Blood Alcohol Concentration (BAC) of 0.04% or higher.
CDL Regulations QuizCDL Exam Study Guide
Everything you need to know about getting your Commercial Driver's License, from requirements to testing procedures.
CDL Test Format & Endorsements
The CDL isn't just one test. It consists of a core General Knowledge exam plus various endorsements depending on the vehicle you want to drive.
The foundation for all CDL classes. Covers inspections, basic control, shifting, backing, visual search, communication, speed management, and hazard perception.
- Topics: Vehicle control, accidents, fires, alcohol rules
- Questions: 50 questions (80% to pass)
Mandatory for any vehicle equipped with air brakes. You must understand the parts of the air brake system, dual air brake systems, and inspection procedures.
- Topics: Air compressors, tanks, S-cam brakes, ABS
- Questions: 25 questions (20 correct to pass)
Required for Class A drivers pulling trailers. Covers tractor-trailer combinations, coupling and uncoupling, and driving techniques for long vehicles.
- Topics: 5th wheel, landing gear, air lines, off-tracking
- Questions: 20 questions (16 correct to pass)
For transporting dangerous goods. Requires a background check (TSA). Covers placarding, loading, unloading, and emergency procedures for hazmat spills.
- Topics: Shipping papers, segregation, bulk packaging
- Questions: 30 questions (24 correct to pass)
Required for drivers hauling liquids or gases in bulk. Focuses on the unique handling characteristics of liquid loads, including surge and baffles.
- Topics: Liquid surge, stopping distance, outages
- Questions: 20 questions (16 correct to pass)
Specialized endorsements for carrying passengers. Includes specific rules for loading/unloading, railroad crossings, and student safety.
- Topics: Pre-trip, prohibited practices, discipline
- Questions: 20 questions each (16 to pass)
Don't just memorize answers—understand the "why." For the pre-trip inspection, develop a consistent routine (e.g., front-to-back, top-to-bottom) so you never miss a component during the skills test. The pre-trip is where most students fail.
CDL Score Calculator
Total Scored Questions
150
105 out of 150 correct
70%
Required to Pass: ~70% (Estimated)
CDL Salary Information
$65,000
Median Annual Salary
CDL Registration Process
Getting your CDL involves federal requirements (ELDT) and state-level testing. Here is the typical path.
- 1Get DOT Medical Card - Pass a physical exam with a certified medical examiner to prove you are fit to drive.
- 2Study & Get CLP - Study the manual and pass the General Knowledge (and Air Brakes/Combo) written tests at the DMV to get your Commercial Learner's Permit.
- 3Complete ELDT Training - Enroll in a registered training provider to complete Entry-Level Driver Training (Theory and Behind-the-Wheel).
- 4Practice Skills - Master the pre-trip inspection, backing maneuvers, and road driving with an instructor.
- 5Schedule Road Test - Book your skills test appointment with the state DMV or a third-party tester.
- 6Pass Skills Test - Successfully perform the Pre-Trip Inspection, Basic Controls (backing), and Road Test.
- 7Collect License - Pay the final license fee and upgrade your CLP to a full CDL.
CDL Test Costs
The cost of obtaining a CDL varies by state and training school choices.
While trucking school tuition can be expensive ($3,000+), many large carriers offer "Paid CDL Training" or tuition reimbursement programs where they cover the cost in exchange for a work contract (usually 1 year).
CDL Career Paths
Trucking offers diverse opportunities beyond just long-haul driving.
OTR DriverOver-the-
Road drivers travel across the country, living in their trucks for weeks at a time. High mileage pay but less home time. Great for seeing the country.
Local Delivery
Drivers operate within a specific city or region, making multiple stops daily. These jobs typically offer home time every night and steady hourly pay.
Hazmat/Tanker
Specialized hauling of liquids, gases, or hazardous materials. Requires additional endorsements and safety training but offers significantly higher pay.
Owner Operator
Drivers who own their own trucks and contract with carriers or find their own loads. High revenue potential but responsible for all maintenance, fuel, and business costs.
Fleet Manager
Experienced drivers can move into management, coordinating routes, managing driver schedules, and overseeing vehicle maintenance and safety compliance.
CDL Testing Contacts
Use these official resources for scheduling tests, medical certification, and regulations.
FMCSA
Federal Regulations
State DMV
Licensing Authority
Website: Find Your State DMV
Services: Permits, Testing, License Issuance
Contact: Visit local website
CVSA
Commercial Vehicle Safety
Amer. Trucking Assns.
Industry Resource
CDL Test Day Checklist
Ready to Get Your CDL?
Join thousands of drivers who passed their CDL exam using our free practice tests. Start with the General Knowledge exam today.
CDL Renewal Requirements
Renewal Period
4-8 Years
Medical Card Every
2 Years
Drivers must self-certify their driving type (Interstate vs. Intrastate) with the DMV and provide a valid Medical Examiner's Certificate (MEC) at least every 24 months to prevent license downgrading.