Idaho CDL practice test

Getting a commercial driver's licence in Idaho starts with the CDL knowledge tests. The content is federal: every state, Idaho included, writes its tests from the FMCSA CDL manual, so the general knowledge test has 50 questions, the endorsement tests have 20 to 30, and the passing score is 80% on each. Idaho Transportation Department administers the test; the rules behind it are published by the FMCSA. Try the free Idaho CDL practice questions below, then pick a full test.

50general knowledge questions
80%passing score on every test
8knowledge tests covered
IDpick your state once in the app

Free Idaho CDL practice quiz

Five questions from the general knowledge, air brakes and combination vehicles banks, the three tests most Idaho Class A applicants take first. Tap an answer to see if you were right and read the explanation.

0 of 5 right0 of 5 answered

The average perception time for an alert driver is about:
How should you take a curve in a heavy vehicle?
On a wet road, you should reduce your speed by about:
On packed snow, you should reduce your speed by:
If the road is icy, the manual says you should:

Every CDL test for Idaho drivers

Each page has a free ten-question quiz, the real question count, the 80% pass mark and what the test covers.

How the Idaho CDL knowledge test works

You take the general knowledge test first; it is required for every CDL class. Class A drivers add the combination vehicles test. Almost everyone takes the air brakes test, because skipping it puts an air brake restriction on the licence. Endorsements (hazmat, tanker, doubles/triples, passenger, school bus) each have their own knowledge test. Pass the tests and you hold a commercial learner's permit; the skills test in a truck comes later.

Fees, appointment rules and test centre locations are set by Idaho; the current ones from Idaho DMV are in the next section. What does not change is the content, and that is what PassRig drills.

Idaho CDL fees and rules

In Idaho the CDL is issued by the Idaho Transportation Department. The figures below are taken from its own pages and were last checked on 2 November 2026. Fees and rules change, so confirm with the agency before you go.

Study from the state's own book: Idaho CDL Manual. PassRig's questions are written from the same FMCSA manual it is based on.

What	ID	Source
Learner's permit fee	$29	itd.idaho.gov
CDL fee	$40 for 4 years or $60 for 8 years	itd.idaho.gov
Knowledge test fee	$5 per test	itd.idaho.gov
Retest fee	$5 per retake	itd.idaho.gov
Permit valid for	1 year	itd.idaho.gov
Minimum age	18	itd.idaho.gov
Appointment	Varies by county office; some require an appointment to test	itd.idaho.gov
If you fail	3 days	itd.idaho.gov
Medical certificate	Medical examiner's certificate required for most commercial driving	itd.idaho.gov
Entry-level driver training	Required for CDL applicants since 7 February 2022	itd.idaho.gov
Also worth knowing	Skills test fee is set by each examiner and may not exceed $190	itd.idaho.gov

2 official pages from Idaho DMV were read for this section. Nothing on it is estimated.

Idaho CDL test questions

How many questions are on the Idaho CDL test?

The Idaho CDL general knowledge test follows the federal model: 50 questions, 40 correct to pass. Endorsement tests are shorter: air brakes 25, hazmat 30, and combination vehicles, tanker, doubles/triples, passenger and school bus 20 each.

What is the passing score on the Idaho CDL permit test?

80% on every knowledge test, the same pass mark used across the United States.

Where do I take the CDL knowledge test in Idaho?

Idaho Transportation Department gives the test. Varies by county office; some require an appointment to test The test content itself comes from the FMCSA CDL manual.

How much does a CDL permit cost in Idaho?

Idaho DMV lists the commercial learner's permit fee as $29. If you fail a knowledge test: 3 days

Does PassRig have Idaho CDL practice questions?

Yes. Pick Idaho in the app and you get practice sets and mock exams built from the knowledge test content your state uses, with the real counts and the 80% line.