Written by Andrei Zakhareuski. With over 16 years of expertise, Andrei leads Driving-Tests.org, a top online resource for driver education. His leadership has established vital partnerships with over 2,600 libraries, educational bodies, and state agencies.
In a hurry? Quick summary: The CDL Doubles/Triples Written Test is a specialized segment of the CDL exams, required for drivers who wish to operate vehicles with double or triple trailers. For a comprehensive guide on acquiring the endorsement, visit our Doubles/Triples Endorsement guide.

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Understanding the Test

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Start a free Doubles/Triples practice test:

  • Alabama - AL - Alabama Doubles/Triples Practice Test
  • Alaska - AK - Alaska Doubles/Triples Practice Test
  • Arizona - AZ - Arizona Doubles/Triples Practice Test
  • Arkansas - AR - Arkansas Doubles/Triples Practice Test
  • California - CA - California Doubles/Triples Practice Test
  • Colorado - CO - Colorado Doubles/Triples Practice Test
  • Connecticut - CT - Connecticut Doubles/Triples Practice Test
  • Delaware - DE - Delaware Doubles/Triples Practice Test
  • District of Columbia - DC - District of Columbia Doubles/Triples Practice Test
  • Florida - FL - Florida Doubles/Triples Practice Test
  • Georgia - GA - Georgia Doubles/Triples Practice Test
  • Hawaii - HI - Hawaii Doubles/Triples Practice Test
  • Idaho - ID - Idaho Doubles/Triples Practice Test
  • Illinois - IL - Illinois Doubles/Triples Practice Test
  • Indiana - IN - Indiana Doubles/Triples Practice Test
  • Iowa - IA - Iowa Doubles/Triples Practice Test
  • Kansas - KS - Kansas Doubles/Triples Practice Test
  • Kentucky - KY - Kentucky Doubles/Triples Practice Test
  • Louisiana - LA - Louisiana Doubles/Triples Practice Test
  • Maine - ME - Maine Doubles/Triples Practice Test
  • Maryland - MD - Maryland Doubles/Triples Practice Test
  • Massachusetts - MA - Massachusetts Doubles/Triples Practice Test
  • Michigan - MI - Michigan Doubles/Triples Practice Test
  • Minnesota - MN - Minnesota Doubles/Triples Practice Test
  • Mississippi - MS - Mississippi Doubles/Triples Practice Test
  • Missouri - MO - Missouri Doubles/Triples Practice Test
  • Montana - MT - Montana Doubles/Triples Practice Test
  • Nebraska - NE - Nebraska Doubles/Triples Practice Test
  • Nevada - NV - Nevada Doubles/Triples Practice Test
  • New Hampshire - NH - New Hampshire Doubles/Triples Practice Test
  • New Jersey - NJ - New Jersey Doubles/Triples Practice Test
  • New Mexico - NM - New Mexico Doubles/Triples Practice Test
  • New York - NY - New York Doubles/Triples Practice Test
  • North Carolina - NC - North Carolina Doubles/Triples Practice Test
  • North Dakota - ND - North Dakota Doubles/Triples Practice Test
  • Ohio - OH - Ohio Doubles/Triples Practice Test
  • Oklahoma - OK - Oklahoma Doubles/Triples Practice Test
  • Oregon - OR - Oregon Doubles/Triples Practice Test
  • Pennsylvania - PA - Pennsylvania Doubles/Triples Practice Test
  • Rhode Island - RI - Rhode Island Doubles/Triples Practice Test
  • South Carolina - SC - South Carolina Doubles/Triples Practice Test
  • South Dakota - SD - South Dakota Doubles/Triples Practice Test
  • Tennessee - TN - Tennessee Doubles/Triples Practice Test
  • Texas - TX - Texas Doubles/Triples Practice Test
  • Utah - UT - Utah Doubles/Triples Practice Test
  • Vermont - VT - Vermont Doubles/Triples Practice Test
  • Virginia - VA - Virginia Doubles/Triples Practice Test
  • Washington - WA - Washington Doubles/Triples Practice Test
  • West Virginia - WV - West Virginia Doubles/Triples Practice Test
  • Wisconsin - WI - Wisconsin Doubles/Triples Practice Test
  • Wyoming - WY - Wyoming Doubles/Triples Practice Test

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How to Prepare

1

Study the CDL Manual

Focus on the doubles/triples section in your state’s CDL manual, which covers all the essentials you need to know.
2

Understand Coupling Procedures

Pay special attention to the safe and correct methods of coupling and uncoupling trailers.
3

Practice Tests

Leverage online practice tests to familiarize yourself with the format and types of questions you’ll encounter. You can find practice tests at Driving-Tests.org.

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Sample Questions

Here are some sample questions to give you an idea of what to expect on the test.

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Details

Exam FeatureDetails
Number of QuestionsTypically 20-30 multiple-choice questions
Passing Score80% or higher
Time LimitVaries by state, usually around 30-60 minutes
Key TopicsCoupling and uncoupling, air brakes, driving safety, vehicle inspection
Test FormatComputer-based in most states
Retake PolicyVaries by state; may include waiting periods and additional fees for retakes
PrerequisiteValid CDL; specific additional requirements may apply
Pro Tip: Hands-on experience with doubles/triples, if possible, can greatly enhance your understanding and preparation for the test.
The CDL Doubles/Triples Written Test is essential for those looking to operate vehicles with multiple trailers. Thorough preparation is key to ensuring safety and compliance on the road. For comprehensive study materials and practice tests, visit Driving-Tests.org.

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