Doubles and Triples CDL Practice Test
Practice with real Doubles/Triples exam questions and detailed explanations. Federally standardized — the same in all 50 states. Rated 4.8 stars by 1,000+ drivers.
Written by CDL holders and exam prep experts · Updated April 2026
Free Questions
10
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
Prerequisites
Valid CDL license required - can be added to any CDL class
What is the Doubles and Triples Endorsement?
The Doubles/Triples endorsement is required to operate commercial vehicles pulling two or three trailers. This endorsement covers coupling procedures, inspection techniques, and the unique handling characteristics of multiple trailers.
State regulations vary - some states restrict or prohibit triples
Topic Breakdown
Coupling and Uncoupling
~8 questions
- Proper coupling procedures
- Air line connections
- Safety chain attachments
Inspection Procedures
~6 questions
- Multi-trailer inspection techniques
- Converter dolly checks
- Air brake system inspection
Driving Techniques
~4 questions
- Backing and turning procedures
- Space management
- Speed and following distance
Safety Considerations
~2 questions
- Rollover prevention
- Emergency procedures
Free Practice Questions
10 questionsQuestion 1 of 10
The purpose of a converter dolly is to:
Browse Doubles/Triples Questions
- 1. The purpose of a converter dolly is to:
- 2. Converter dollies:
- 3. The converter dolly air tank drain valve on coupled double/triple trailers should be:
- 4. Crack-the-whip effect occurs when:
- 5. Which of these statements about the handling of doubles and triples is true?
- 6. Which trailer is most affected by the crack-the-whip, resulting in a rollover?
- 7. Which statement is true regarding the coupling of a triple?
- 8. Before you can supply air to the air tanks of a second trailer you need to:
- 9. When driving a truck with more than one trailer, which trailer should be first behind the truck?
- 10. When pulling multiple trailers, where should the heaviest trailer be located?
Study Tips
- 1Master coupling and uncoupling procedures
- 2Understand the crack-the-whip effect
- 3Practice backing maneuvers mentally
- 4Know increased stopping distances
- 5Check state regulations for triples restrictions
CDL Requirements by State
The Doubles/Triples knowledge test is federally standardized, so the questions are the same nationwide. Age, renewal, and training rules vary by state — find yours below.
| State | Min Age (Intra / Inter) | Renewal | ELDT |
|---|---|---|---|
| California | 18 / 21 | 5 yrs | Required |
| Texas | 18 / 21 | 4 yrs | Required |
| Florida | 18 / 21 | 4 yrs | Required |
| New York | 18 / 21 | 8 yrs | Required |
| Pennsylvania | 18 / 21 | 4 yrs | Required |
| Illinois | 18 / 21 | 4 yrs | Required |
| Ohio | 18 / 21 | 4 yrs | Required |
| Georgia | 18 / 21 | 5 yrs | Required |
| Michigan | 18 / 21 | 4 yrs | Required |
| North Carolina | 18 / 21 | 5 yrs | Required |
| Alabama | 18 / 21 | 4 yrs | Required |
| Alaska | 18 / 21 | 5 yrs | Required |
| Arizona | 18 / 21 | 5 yrs | Required |
| Arkansas | 18 / 21 | 4 yrs | Required |
| Colorado | 18 / 21 | 5 yrs | Required |
| Connecticut | 18 / 21 | 4 yrs | Required |
| Delaware | 18 / 21 | 8 yrs | Required |
| Hawaii | 18 / 21 | 4 yrs | Required |
| Idaho | 18 / 21 | 4 yrs | Required |
| Indiana | 18 / 21 | 4 yrs | Required |
| Iowa | 18 / 21 | 5 yrs | Required |
| Kansas | 18 / 21 | 4 yrs | Required |
| Kentucky | 18 / 21 | 4 yrs | Required |
| Louisiana | 18 / 21 | 4 yrs | Required |
| Maine | 18 / 21 | 6 yrs | Required |
| Maryland | 18 / 21 | 8 yrs | Required |
| Massachusetts | 18 / 21 | 5 yrs | Required |
| Minnesota | 18 / 21 | 4 yrs | Required |
| Mississippi | 18 / 21 | 4 yrs | Required |
| Missouri | 18 / 21 | 6 yrs | Required |
| Montana | 18 / 21 | 4 yrs | Required |
| Nebraska | 18 / 21 | 5 yrs | Required |
| Nevada | 18 / 21 | 4 yrs | Required |
| New Hampshire | 18 / 21 | 5 yrs | Required |
| New Jersey | 18 / 21 | 4 yrs | Required |
| New Mexico | 18 / 21 | 4 yrs | Required |
| North Dakota | 18 / 21 | 5 yrs | Required |
| Oklahoma | 18 / 21 | 4 yrs | Required |
| Oregon | 18 / 21 | 8 yrs | Required |
| Rhode Island | 18 / 21 | 5 yrs | Required |
| South Carolina | 18 / 21 | 5 yrs | Required |
| South Dakota | 18 / 21 | 5 yrs | Required |
| Tennessee | 18 / 21 | 5 yrs | Required |
| Utah | 18 / 21 | 5 yrs | Required |
| Vermont | 18 / 21 | 4 yrs | Required |
| Virginia | 18 / 21 | 8 yrs | Required |
| Washington | 18 / 21 | 5 yrs | Required |
| West Virginia | 18 / 21 | 5 yrs | Required |
| Wisconsin | 18 / 21 | 4 yrs | Required |
| Wyoming | 18 / 21 | 4 yrs | Required |
Career Opportunities
Want the full background on this endorsement?
Read the complete Doubles and Triples endorsement guide →Frequently Asked Questions
You need this endorsement to drive commercial vehicles pulling two or three trailers, subject to state highway regulations.
Doubles/Triples Study Resources
Be Ready for Your Doubles/Triples Test
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