Idaho Doubles and Triples Test
Idaho's wind gusts on I-84 near the Snake River can push your rear trailer sideways—this test covers how to handle it.
Select Test Mode
The Idaho Doubles and Triples test has 20 questions. You need 16 right to pass—study the coupling sequence and trailer handling.
Key Topics
- •Coupling and uncoupling sequence
- •Trailer stability in wind and grades
- •Off-tracking and turning radius
About the Idaho Doubles and Triples Test
Topics Covered
- ✓Coupling and uncoupling procedures – Idaho examiners expect the full sequence, especially when parking on uneven ground at places like the Port of Lewiston.
- ✓Trailer stability and rollover prevention – Idaho's gusty winds on I-84 near the Snake River can push a tall trailer sideways; you need to know when to slow down or pull over.
- ✓Off-tracking and turning – Longer combinations cut tighter corners; Idaho's narrow two-lane roads through the mountains leave no room for error.
- + 3 more topics
📘 Study Tips & State Info
When you study for the Idaho Doubles and Triples test, focus on the coupling procedure step by step. The DMV examiners here ask specific questions about the order of hooking up air lines, raising the landing gear, and checking the pintle hook. Mixing up the steps is the #1 reason people fail this test.
Also, pay attention to wind speed rules. Idaho's CDL manual says you can't operate doubles or triples when wind speeds exceed 45 mph or when the National Weather Service issues a high wind warning. That's a common test question. Think about actual places like I-84 between Boise and Mountain Home where those winds hit. The examiners want you to apply the rule, not just recite it.
Finally, practice the pre-trip inspection for a set of doubles. Idaho requires you to check the dolly tires, the converter gear, and the safety chains. If you can walk through that inspection in your head, you'll handle the questions easily.
The Idaho Transportation Department (ITD) handles all CDL testing. You can take the written knowledge test at any full-service DMV office. Major locations include Boise, Idaho Falls, Coeur d'Alene, Lewiston, and Twin Falls. Appointments are strongly recommended—walk-ins are accepted but you might wait hours.
Fees: The Doubles and Triples endorsement costs $15 on top of your CDL permit or license fee. You'll need a valid Medical Examiner's Certificate (DOT physical) before you can test. The test is computer-based, and you'll get your results immediately.
Idaho also allows third-party testing at some trucking schools and private testing centers. Check the ITD website for an approved list. If you fail, you can retake the test the next business day. No waiting period.
About the Idaho Doubles and Triples Test
If you're planning to pull doubles or triples in Idaho, you need this endorsement. It's not just about hitching two trailers together. You have to know how they behave on grades, in crosswinds, and during winter conditions on roads like I-90 over Lookout Pass.
The test covers coupling and uncoupling, off-tracking, and how to prevent rollovers. Idaho's combination of mountain passes, high winds in the Snake River Plain, and heavy agricultural traffic means the examiners focus on real-world safety. They don't care if you can memorize a list—they want to know you can keep a set of doubles stable when a gust hits near Burley.
You'll take this test at any Idaho DMV office that offers CDL written exams. Expect 20 multiple-choice questions, 80% to pass. Most people who fail miss the coupling sequence questions or the wind-related braking procedures. Pay attention to those.
Topics Covered
Study Tips
When you study for the Idaho Doubles and Triples test, focus on the coupling procedure step by step. The DMV examiners here ask specific questions about the order of hooking up air lines, raising the landing gear, and checking the pintle hook. Mixing up the steps is the #1 reason people fail this test.
Also, pay attention to wind speed rules. Idaho's CDL manual says you can't operate doubles or triples when wind speeds exceed 45 mph or when the National Weather Service issues a high wind warning. That's a common test question. Think about actual places like I-84 between Boise and Mountain Home where those winds hit. The examiners want you to apply the rule, not just recite it.
Finally, practice the pre-trip inspection for a set of doubles. Idaho requires you to check the dolly tires, the converter gear, and the safety chains. If you can walk through that inspection in your head, you'll handle the questions easily.
Idaho Specific Information
The Idaho Transportation Department (ITD) handles all CDL testing. You can take the written knowledge test at any full-service DMV office. Major locations include Boise, Idaho Falls, Coeur d'Alene, Lewiston, and Twin Falls. Appointments are strongly recommended—walk-ins are accepted but you might wait hours.
Fees: The Doubles and Triples endorsement costs $15 on top of your CDL permit or license fee. You'll need a valid Medical Examiner's Certificate (DOT physical) before you can test. The test is computer-based, and you'll get your results immediately.
Idaho also allows third-party testing at some trucking schools and private testing centers. Check the ITD website for an approved list. If you fail, you can retake the test the next business day. No waiting period.