Idaho CDL practice test
To get a commercial learner's permit in Idaho you pass the Idaho ITD DMV knowledge tests for your vehicle class and endorsements. The tests are based on the state's commercial driver manual; our CDL practice tests follow the same national model manual that Idaho's manual is based on.
Idaho CDL knowledge tests
| Test | Questions | To pass |
|---|---|---|
| General Knowledge and endorsement tests (P, S, N, H, T, air brakes) | – | – |
"–" means the ITD DMV doesn't publish the figure.
Getting a CDL in Idaho
- Decide your class (A, B or C) and endorsements, and read those sections of the manual.
- Pass the knowledge tests at the ITD DMV to get your commercial learner's permit (CLP). Federal rules also require a medical certificate for most drivers.
- Hold the CLP for at least 14 days. First-time Class A and B applicants, and anyone adding the passenger, school bus or hazmat endorsement, must finish entry-level driver training with a provider on the FMCSA Training Provider Registry before the skills test.
- Pass the skills test: pre-trip inspection, basic control and an on-road drive.
You must be at least 21 to drive a commercial vehicle across state lines or carry hazardous materials that need placards. More about CDL classes and tests.
Practise for each test
- General knowledgeRequired for every CDL: inspection, vehicle control, space and speed, hazards, emergencies, cargo.
- Air brakesNeeded to drive vehicles with air brakes; without it you get an air brake restriction.
- Combination vehiclesFor tractor-trailers and other combinations (Class A).
- Hazardous materialsFor the H endorsement; also needs a TSA background check.
- Tanker vehiclesFor the N endorsement: liquids and gases in bulk.
- Passenger transportFor the P endorsement: buses and vehicles for 16 or more people.
- School busFor the S endorsement, together with the passenger endorsement.
- Doubles and triplesFor the T endorsement: pulling two or three trailers.
Which tests do you need?
- Everyone: general knowledge.
- Tractor-trailers and other Class A combinations: combination vehicles, plus air brakes if the vehicle has them.
- Buses: passenger transport, and school bus for school buses.
- Endorsements: hazardous materials (H), tank vehicles (N) and doubles/triples (T) each have their own test.
If you don't pass the air brakes test, your CDL gets an air brake restriction.
The Idaho CDL manual
Download the official commercial driver manual from the Idaho Transportation Department, Division of Motor Vehicles (licenses issued through county sheriff driver's license offices). Read the sections for the tests you're taking.
Minimum age 18. CDL knowledge test $5; skills test $200.
Source: Idaho Transportation Department, Division of Motor Vehicles (licenses issued through county sheriff driver's license offices), checked 2026-10-27.