The knowledge test is available in 4 languages (interpreters aren't allowed):
- English
- Spanish
- Russian
- Serbian–Croatian
Make an appointment to take the knowledge test at a driver licensing office location that offers testing. The test fee covers 1 attempt at each knowledge test taken within 90 days of the receipt.
You must pass the knowledge test and get a Commercial Learner's Permit (CLP):
- Before you can take the skills test.
- Any time you upgrade your CDL by:
- A higher commercial class
- Adding endorsements that require a skills test:
- Passenger endorsement
- School bus endorsement
- Tank vehicle endorsement (only if testing and or training in tank vehicle)
- Removing an air brake restriction
You're required to take the knowledge test any time you:
- Transfer
- Add
- Renew a hazardous material endorsement (HME). See hazardous materials endorsement (hazmat) for more information on HME requirements.
Knowledge test scores are valid for:
- 180 days from the date passed.
- Another 180 days, if you renew your CLP within 30 days of your original CLP expiring. Double, triple, and hazardous materials cannot be renewed with CLP and expire 180 days from the date passed.
CDL general knowledge (A, B, & C) | 50 | 40 | Yes |
CDL combination (A) | 20 | 16 | Yes |
Passenger | 20 | 16 | Yes |
Air brakes | 25 | 20 | Yes |
School bus | 20 | 16 | Yes |
Double/triple | 20 | 16 | No |
Tank vehicle | 20 | 16 | No, unless you're taking your skills test or training in a commercial tank vehicle, then you must take the knowledge test before we can issue your CLP. |
Hazardous materials | 30 | 24 | No |
How to prepare
- Study the Commercial driver guide to prepare for the test. The guide is only available in English and contains all the information you'll need to pass the test. In the first chapter you will find a table titled "What sections should you study?" This table indicates with an "x" which section(s) you should study before taking the tests.
- You may also take the practice test for a sample of the types of questions that will be on the test.
Penalties for trying to get a CDL fraudulently could include:
- Cancellation of your driver license.
- Having to wait up to 1 year before you can apply again for a CDL.
Questions? Need help?
Call us: 360.902.3900 (TTY: Call 711)
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- What is Commercial Driver License Test?
- Types of CDL
- What is a CDL license?
- What is a hardship license?
- How to get a Class A license
- How to get a Class B license
- How to get a Class C license
- Tips and tricks to passing a CDL examination
- Medical Documentation Requirements
- International Registration Plan International Fuel Tax Agreement
- How to apply for a CDL license
- Driving Safely
- Inspection of Vehicle
- Rules and regulations for CDL drivers
- Basic Control of Your Vehicle
- Aggressive Drivers/Road Rage
- Driving in Very Hot Weather
- Driving Emergencies
- Mountain Driving
- Railroad-Highway Crossing
- Antilock Braking System (ABS)
- Skid Control and Recovery
- Accident Procedures
- Hazardous Material Rules for all Commercial Drivers
- Transporting Passengers Safely
- After-Trip Inspection
- Use of Brakes-Door Interlocks
- Loading and Trip Start
- Prohibited Practices
- Transporting Cargo Safely
- Inspecting Cargo
- Inspecting Air Brake Systems
- Using Air Brakes
- Combination Vehicles
- Driving Combination Vehicles Safely
- Antilock Brake Systems
- Combination Vehicle Air Brakes
- Inspecting a Combination Vehicle
- Doubles and Triples
- Inspecting Doubles and Triples
- Pulling Double/Triple Trailers
- Doubles/Triples Air Brake Check
- Inspecting Tank Vehicles
- Emergency Exit and Evacuation
- Railroad-Highway Crossings
- Pre-Trip Vehicle Inspection Test
- External Inspection (All Vehicles)
- Taking the CDL Pre-Trip Inspection Test
- Basic Vehicle Control Skills Test
- CDL Practice Test
- Frequently asked Questions and Answers
- And many more….
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