Idaho Doubles and Triples Test

About the Idaho Doubles and Triples Test

Idaho's roads demand a lot from drivers pulling doubles and triples. You'll navigate steep grades on US-95 and White Bird Hill, or battle crosswinds on I-84 near the Snake River. This practice test focuses on the skills you need to keep those trailers stable and safe.

Idaho's economy relies on trucks hauling potatoes, timber, and goods. Doubles are common on interstates like I-15 and I-84, especially between distribution centers. But winter weather adds risk – black ice near Lookout Pass or sudden snow squalls in the Panhandle mean you must master braking and coupling.

We've pulled questions straight from the Idaho CDL handbook. You'll see air brake checks, coupling procedures, and weight distribution rules that apply to local operations. Each question includes an explanation so you learn why the answer matters for Idaho driving.

Take this test multiple times until you score 80% or higher. Then schedule your DMV appointment and bring your knowledge. Idaho doesn't let you skip the T endorsement – you must earn it.

What This Test Covers

• Coupling and uncoupling procedures – critical for Idaho's steep grades where a poor coupling can lead to disaster.
• Air brake systems – you'll need them on long downhill runs on I-84.
• Speed limits and braking distances – Idaho's open highways require careful stopping.
• Weight distribution – hauling potatoes or lumber requires proper load balance.
• Multi-unit vehicle inspections – Idaho DOT checks are thorough.
• Emergency procedures – blowouts in remote areas like central Idaho demand quick action.

Study Tips

Study the Idaho CDL handbook's doubles and triples section. Focus on coupling steps – most test questions come from that. Practice inspecting dummy couplings and gladhands if you can. Idaho DMV skill tests emphasize a full pre-trip.

Use our practice test to identify weak spots. Retake it until you consistently get 17 or more correct. Many Idaho drivers fail because they skip air brake questions. Don't make that mistake.

Book your knowledge test appointment online. Bring your permit, proof of residency, and $50 fee. The T endorsement costs an extra $10. You can do it at any Idaho DMV office that offers CDL testing.

Idaho DMV Information

Idaho DMV offers CDL knowledge tests at most offices – Boise, Coeur d'Alene, Idaho Falls, Twin Falls, and more. You need an appointment for skills tests. Walk-ins are rare, so call ahead.

Fees: $50 for CDL knowledge test (includes all endorsements). The doubles/triples endorsement adds $10. Skills test is $90. Bring a valid truck for the road test – it must pass a pre-trip inspection.

You can take the knowledge test in English or Spanish. Idaho doesn't offer a written test in other languages. If you fail, you must wait one day to retest. No limit on attempts per year, but each test costs the same fee.

Frequently Asked Questions

Related Resources

Other Idaho CDL Practice Tests

Test Details

• State: Idaho
• Test: Doubles and Triples Test
• Questions: 93
• Passing Score: 80%
• Time Limit: 25 minutes
• Cost: Free

Need ELDT Training?

If you're getting your first CDL, you need ELDT theory training before your skills test.