CDL DOUBLES TRIPLES PRACTICE TEST IDAHO

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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The Idaho doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The ID CDL doubles triples test covers the following sections of the Idaho CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this ID CDL practice test now to prepare for the actual test! Important: Triple trailers are not legal in Idaho.
1. ABS helps you:
lock your wheels.
decrease your average speed.
keep the wheels from locking up.
2. You as a driver should always:
reduce your following distance.
make emergency plans when you see a hazard.
stay in your lane.
3. You are driving a heavy vehicle with a manual transmission, and you have to stop on the shoulder while driving on an uphill grade. When putting your vehicle back in motion up the grade, you should:
shift down to a speed that you can control without using the brakes.
partly engage the clutch before you take your right foot off the brake.
use the parking brake to hold the vehicle until the clutch engages.
4. When preparing to make a right turn, you should NOT turn wide to the left as you start the turn. Why?
It makes the turn harder.
A following driver may try to pass you on the right.
Turning wide to the left can cause your vehicle to tilt.
5. If you doubt you have enough space to pass under a bridge, you should:
drive faster.
turn on your headlights.
go slowly.
6. Tire load is defined as:
the maximum safe weight a tire can carry at a specified pressure.
the minimum safe weight a tire can carry at a specified pressure.
the weight transmitted to the ground by 1 tire.
7. As part of your vehicle inspection, you are checking that air flows to all trailers. After using the trailer handbrake to provide air to the service line, you go to the rear of the rig. When you open the emergency line shut-off valve at the rear of the last trailer, you should hear:
air escaping from the open valve.
a mechanical vibration.
the service line valve close.
8. If the air compressor is belt-driven, you should check the air compressor drive belt before each trip. The belt should be:
tight.
cracked.
loose.
9. Hanging meat in a refrigerated truck can be:
a very stable load if properly distributed.
a very unstable load with a high center of gravity.
a very unstable load with a low center of gravity.
10. If your ABS malfunctions:
you still have normal brake functions.
the service brake will not work.
you should immediately come to a complete stop.
 
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Frequently Asked Questions

If you are between 14½ and under 17 years old you must follow the Graduated Driver Licensing (GDL) Program. You can apply for a supervised instruction permit and complete an approved driver training program. After 6 months of violation-free supervised driving, you can apply for a restricted driver’s license (it will be restricted until your 18th birthday).

If you are 17 or older you can apply for a class D instruction permit and after six months of supervised driving, you can obtain a class D driver’s license.

To schedule the DMV written test in Idaho, you can visit your county Sheriff’s DMV office in person. Find the Idaho DMV office nearest to you and check its business hours.

You are required to bring the following documents:
  • Proof of identity and age.
  • Photo ID.
  • Proof of Idaho residency.
  • Social Security Card.
  • Proof of US citizenship or legal presence.
  • Driver training completion certificate (for applicants under 17).
  • Liability Signer (for those under 18, a parent or guardian must sign consent for licensing).
  • Proof of school enrollment (for those under 18).

Additionally, if applicable:
  • Foreign driver’s license.
  • Medical certification (if you have a medical condition that may affect your ability to drive).

Use the tool provided by the Idaho Transportation Department to create a checklist of the necessary documents.

The DMV written test in Idaho is offered in various languages, including English, Arabic, Chinese, Farsi, French, Korean, Russian, Servo-Croatian, Spanish, Vietnamese and ASL (American Sign Language). Although language options are provided, it is advisable to have a basic understanding of English since road signs are always in English.
The DMV written test covers various topics, such as road signs, parallel parking, turning, passing a vehicle, yielding the right of way, etc. Studying the official Idaho Driver’s Handbook is the first step to prepare for the exam because it contains all of this information. Once you've read it, you can take our free practice tests!
The Idaho DMV written test consists of 40 questions and is based on the information provided in the manual. Taking numerous practice tests and thoroughly reading the handbook will increase your chances of success.

You are allowed to miss up to 6 questions, with a minimum accuracy rate of 85%. Using any written, audio, or electronic aid is forbidden.

New drivers in Idaho are subject to specific restrictions:

  • If you are younger than 16, you can drive only during daylight hours, except when accompanied by a licensed driver aged at least 21, who must be seated beside you.  Additionally, you cannot transport any other passengers. 
  • If you are under 17, during the first six months from the date the license was issued, you can only transport one passenger under 17 or family members.
  • If you are under 21, you cannot drive after drinking any amount of alcohol (Zero Tolerance law).
An Idaho instruction permit remains valid for 180 days after successfully completing a driver training program and the GDL Program. You can renew the permit once without retaking the knowledge test, as long as you took it within the past 12 months.
If you fail your DMV written test, you must wait three days to retest and pay another application fee. Sign up for DMV Premium and practice with extra tests to maximize the chance of passing!

ID CDL Doubles Triples Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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