First published: September 3, 2026Last verified: September 3, 2026Reviewed by the CertQuestUSA team
TL;DR
CDL General Knowledge (Idaho): a 124-question practice bank for the real CDL Permit & Endorsement Exams standard, 2 full papers of 50 questions each with no repeats, every question citing the real regulation it comes from.
Where these questions come from
Every question in this bank cites a real source -- primarily FMCSA CDL Manual (77%) and 49 CFR (23%) of this exam's citations.
Not sure where you stand? Take the free diagnostic — 10 real questions across the exam's domains, no sign-up required, with a domain-by-domain breakdown at the end.
The knowledge tested here is federal (FMCSA) and identical nationwide -- what varies by state is who administers it and under what terms. Researched directly from Idaho Transportation Department (ITD), Division of Motor Vehicles's own site, verified 2026-09-03.
$40.00 for a 4-year CDL or $60.00 for an 8-year CDL
Road/skills test fee
Skills test fee is set by each individual examiner, not to exceed $190 per Idaho Code
Minimum CLP hold before road test
14 days (ITD: "Federal Rules require you hold a CLP for at least 14 days before you can take a skills test")
CLP validity
1 year
Retake wait after a failed knowledge test
3 days, plus a $5.00 retest fee (per ITD's Ten Steps to Getting an Idaho CDL guide)
Spanish-language knowledge test
Available
A Spanish-language version of the Idaho CDL Manual is confirmed available directly from ITD (accessible via dmv.idaho.gov > Driver Services), and search results describe Idaho as offering the knowledge test in roughly 12 languages plus ASL with translator support for any language not on the list. However, this research could not directly fetch and quote an ITD page confirming the CDL KNOWLEDGE TEST itself (as opposed to just the study manual) is offered in Spanish, so this should be verified directly against dmv.idaho.gov before publishing with full confidence. No 2025/2026 policy change was found.
Idaho's skills test fee is examiner-set (capped at $190 by state law) rather than a single flat statewide fee -- worth noting on a landing page so users don't expect one fixed number.
5 real sample questions
What is the most important reason for performing a pre-trip inspection before every trip?
A. To satisfy your dispatcher that the truck left on time
B. To find problems that could cause a crash or breakdown before they happen on the road
C. To reduce the number of miles logged for the day
D. To avoid having to fill out any paperwork later
Source: FMCSA CDL Manual §2.1.1
A roadside inspector determines that a commercial motor vehicle has a safety defect serious enough to be an immediate hazard. What is the inspector authorized to do under 49 CFR 396.9?
A. Issue a warning only, since only the motor carrier can pull a vehicle from service
B. Declare the vehicle "out of service" until the defect is corrected
C. Impound the vehicle permanently
D. Fine the driver but allow the vehicle to continue to the next scheduled stop
Source: 49 CFR 396.9
Under the federal tire tread depth standard, what is the minimum tread depth allowed in any major tread groove on a steering axle tire?
A. 1/32 inch
B. 2/32 inch
C. 4/32 inch
D. 6/32 inch
Source: 49 CFR 393.75
What is the minimum tread depth required on non-steering axle tires of a commercial motor vehicle?
A. 1/32 inch
B. 2/32 inch
C. 3/32 inch
D. 4/32 inch
Source: 49 CFR 393.75
Under 49 CFR 392.7, a driver may not operate a commercial motor vehicle unless satisfied that certain systems are in good working order. Which of the following is included in that pre-trip requirement?
A. The radio and cab air-conditioning system
B. Service brakes, trailer brake connections, parking brake, tires, lights, and mirrors
C. The cruise control set speed
D. The fuel economy displayed on the dashboard computer
How many questions are on the CertQuestUSA CDL General Knowledge (Idaho) practice test?
124 questions total, split into 2 full papers of 50 each with no repeats across papers.
What topics does the CDL General Knowledge (Idaho) test cover?
13 domains, with the heaviest weight on Vehicle Inspection (14%), Basic Control & Shifting (10%), and Emergency Maneuvers & Skid Control (10%).
Where do CertQuestUSA's CDL General Knowledge (Idaho) questions come from?
Primarily FMCSA CDL Manual (77%) and 49 CFR (23%) of this bank's citations -- computed directly from this exam's own question sources, not a generic description.
Is there a free diagnostic for CDL General Knowledge (Idaho)?
Yes -- 10 real questions across the exam's domains, no sign-up required, with a domain-by-domain breakdown at the end.
Still need a CDL school, a DOT physical, or tuition help?
CDL Schools USA, our sister site, lists FMCSA-registered schools by state, paid training programs, DOT physical clinics, and WIOA and GI Bill funding.
