Delaware Doubles and Triples Test
Delaware's tight interchanges on I-95 and narrow two-lane roads on the Delmarva Peninsula make doubles and triples a different animal — this test prepares you for that reality.
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Delaware's Doubles and Triples test is 20 questions, 80% to pass. You'll need this endorsement if you plan to pull two or three trailers through I-95 construction zones or the Port of Wilmington.
Key Topics
- •Coupling and uncoupling sequence
- •Trailer sway and off-tracking
- •Braking and emergency procedures
About the Delaware Doubles and Triples Test
Topics Covered
- ✓Coupling and uncoupling procedures — Delaware examiners want the exact sequence, especially the air supply check on the first trailer.
- ✓Trailer stability and sway control — on I-95, crosswinds from open fields near the C&D Canal can push a set of doubles sideways.
- ✓Off-tracking and turning — tight corners on Route 9 near the Port of Wilmington require knowing how far your rear trailer will swing.
- + 3 more topics
📘 Study Tips & State Info
Start with the coupling procedure. The Delaware DMV examiners ask it step-by-step. They want to hear you say "connect the air lines to the first trailer before the second trailer" and "charge the air system before backing under the kingpin." Miss a step, and you'll lose the question. Write the sequence down and recite it out loud until it's automatic.
Next, focus on off-tracking. Delaware has short-radius turns, especially at the I-95/I-495 interchange and on Route 13 in Dover. Know that the rear trailer of a triple will track several feet inside the path of the tractor. The manual gives you a table — memorize the numbers for 40-foot and 28-foot trailers. That's a sure bet on the test.
Finally, learn how wind and weather affect stability. Delaware gets Nor'easters that bring sustained 30 mph gusts. The test will ask about reducing speed in high winds and when to pull over. Think about the I-95 bridge over the C&D Canal — that's a spot where doubles get pushed around. Tie each manual rule to a real Delaware road, and the answers will stick.
The Delaware DMV administers the Doubles and Triples written test at all three full-service CDL locations: Dover (303 Transportation Circle), Wilmington (2230 W. 7th Street), and Georgetown (23734 Shortly Road). You must have a valid Delaware Class A CDL or CDL learner's permit before you can take the endorsement test. Walk-ins are accepted, but appointments are strongly recommended — the Dover office gets busy, especially on Saturdays.
You'll need to bring your valid Medical Examiner's Certificate (DOT physical) and proof of Delaware residency. The test fee is $12 for the endorsement written test (as of 2025). If you pass, the endorsement will be added to your CDL. If you fail, you can retake it the next business day — no waiting period for written tests in Delaware.
One Delaware-specific quirk: the DMV does not offer the Doubles and Triples test on the skills portion. Written endorsement only. But you still need to demonstrate the ability to operate doubles/triples during your road test if you want the restriction removed. Check with the examiner before your skills appointment to confirm what they expect.
About the Delaware Doubles and Triples Test
Delaware may be the second-smallest state, but it's a major hub for freight. The Port of Wilmington handles millions of tons of cargo each year, and I-95 and Route 1 carry trucks from the Northeast to the Mid-Atlantic. If you're planning to pull doubles or triples — two or three trailers at once — you'll need this endorsement on your Class A CDL.
Doubles and triples handle differently than a single trailer. They're longer, they sway more, and they off-track harder on tight turns. Delaware's roads don't help: the I-95/I-495 split near the port has sharp curves, and Route 13 through Dover has narrow lanes with heavy local traffic. That's why the Delaware DMV tests you on coupling, stability, and emergency procedures specific to multi-trailer combinations.
The written test is 20 multiple-choice questions based on the Delaware CDL Manual. You need 16 correct to pass. The test covers coupling and uncoupling sequences, trailer sway control, braking distances, and how to inspect your rig. Delaware examiners pay close attention to the step-by-step coupling procedure — they've seen too many drivers skip the air supply check on the first trailer.
Don't expect a free pass just because you've driven singles for years. Doubles and triples demand more planning, especially in winter when Delaware's coastal storms and Nor'easters can turn I-95 into a skating rink. Take the practice test to see where you stand before you sit for the real thing.
Topics Covered
Study Tips
Start with the coupling procedure. The Delaware DMV examiners ask it step-by-step. They want to hear you say "connect the air lines to the first trailer before the second trailer" and "charge the air system before backing under the kingpin." Miss a step, and you'll lose the question. Write the sequence down and recite it out loud until it's automatic.
Next, focus on off-tracking. Delaware has short-radius turns, especially at the I-95/I-495 interchange and on Route 13 in Dover. Know that the rear trailer of a triple will track several feet inside the path of the tractor. The manual gives you a table — memorize the numbers for 40-foot and 28-foot trailers. That's a sure bet on the test.
Finally, learn how wind and weather affect stability. Delaware gets Nor'easters that bring sustained 30 mph gusts. The test will ask about reducing speed in high winds and when to pull over. Think about the I-95 bridge over the C&D Canal — that's a spot where doubles get pushed around. Tie each manual rule to a real Delaware road, and the answers will stick.
Delaware Specific Information
The Delaware DMV administers the Doubles and Triples written test at all three full-service CDL locations: Dover (303 Transportation Circle), Wilmington (2230 W. 7th Street), and Georgetown (23734 Shortly Road). You must have a valid Delaware Class A CDL or CDL learner's permit before you can take the endorsement test. Walk-ins are accepted, but appointments are strongly recommended — the Dover office gets busy, especially on Saturdays.
You'll need to bring your valid Medical Examiner's Certificate (DOT physical) and proof of Delaware residency. The test fee is $12 for the endorsement written test (as of 2025). If you pass, the endorsement will be added to your CDL. If you fail, you can retake it the next business day — no waiting period for written tests in Delaware.
One Delaware-specific quirk: the DMV does not offer the Doubles and Triples test on the skills portion. Written endorsement only. But you still need to demonstrate the ability to operate doubles/triples during your road test if you want the restriction removed. Check with the examiner before your skills appointment to confirm what they expect.