OFFICIAL WASHINGTON DOL · PUBLIC PDF
Commercial Driver Guide
Start here for CDL knowledge-test study: safe driving, vehicle systems, cargo, air brakes, combination vehicles and endorsements.
Open the CDL Guide PDF ↗Student resources
Start studying for your permit.
Free Washington DOL study materials for future students, current students and anyone exploring a CDL.
OFFICIAL SKILLS-TEST SUPPLEMENT · PUBLIC PDF
Modernized skills supplement
Use this companion to the main guide for the vehicle inspection and basic control skills test. DOL says it replaces Sections 11 and 12 of the main guide.
Open the Skills Supplement PDF ↗This is the public state guide. 3C’s own pre-trip lessons and training materials are separate student materials.
These links open the official state files. On a phone, use your browser’s Share or Save options to keep a PDF for offline study. If a download link changes, use DOL’s official guide page ↗ to find the current version.
What should I study first?
Use the guide’s study chart and confirm your tests with Enrollment. Your license class, existing license and intended vehicle determine the sections you need.
- Class A with air brakes: focus on General Knowledge, Air Brakes and Combination Vehicles.
- Class B with air brakes: focus on General Knowledge and Air Brakes.
- Passenger, school bus, tanker, doubles/triples or Hazmat: study the applicable endorsement sections and confirm prerequisites. First-time Hazmat applicants need required ELDT before the Hazmat knowledge test.
Reading the guide or taking a practice test does not count as completing ELDT or a school course.
FOR ENROLLED STUDENTS
3C’s pre-trip & ELDT materials
Our school-specific inspection lessons, walkthroughs, ELDT coursework and assessments will be available through a separate student login. Those materials are not published on this public study page.
Online student access is not open yet. Enrolled students should contact the school for their assigned materials and instructions.
Official source: Washington State Department of Licensing. Links reviewed October 25, 2026.