CDL Permit Test Prep - Rigvo

Rigvo is CDL permit test prep for all eight CDL knowledge tests: General Knowledge, Air Brakes, Combination Vehicles, HazMat, Tanker, Doubles/Triples, Passenger and School Bus. Use it as your CDL study guide and practice test and see your pass chance after a few questions.

WHY RIGVO
• Every answer explains why it is right. 219 questions link straight to the federal rule (49 CFR) they rest on. Found a mistake? Report it from the question.
• Practice shows the answer right away. The exam simulator works like the real test: 50 questions for General Knowledge, 25 for Air Brakes, 30 for HazMat, 20 for the others, 80 % to pass, results at the end.
• Pass chance: your chance to pass today from everything you answered, plus the topics that hold you back.
• Weak-spots drill: questions you miss come back until you know them.
• Pre-trip inspection trainer: zone by zone, with what to check and a line to say out loud the way the examiner wants to hear it. Drill mode hides the line until you said it yourself.
• In-cab air brake check step by step with the value that must pass (leak-down, low-air warning, spring brakes, governor, build-up).
• No account, no ads. Your progress stays on your phone.

WHAT IS FREE
• 50 General Knowledge practice questions across all topics
• One full 50-question General Knowledge mock exam
• 3 sample questions for each of the other seven tests
• The first pre-trip zone (engine compartment) and your pass chance

RIGVO PRO
• All 700 questions in all 8 tests
• Unlimited exam simulator for every test
• Weak-spots drill
• The full pre-trip trainer for Class A, Class B and buses, and the in-cab air brake check
Pro is a monthly or yearly subscription through Google Play. Cancel anytime in Google Play.

SOURCES
Our own questions. 219 rest on a federal rule (49 CFR) and link to it in the app; the rest cover general commercial driving practice. Main parts:
• 49 CFR Part 171 (HazMat rules): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol2/pdf/CFR-2025-title49-vol2-part171.pdf
• 49 CFR Part 172 (HazMat table, placards): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol2/pdf/CFR-2025-title49-vol2-part172.pdf
• 49 CFR Part 173 (hazard classes): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol2/pdf/CFR-2025-title49-vol2-part173.pdf
• 49 CFR Part 177 (highway carriage): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol2/pdf/CFR-2025-title49-vol2-part177.pdf
• 49 CFR Part 382 (drug and alcohol tests): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-part382.pdf
• 49 CFR Part 383 (CDL standards): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-part383.pdf
• 49 CFR Part 390 (definitions): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-part390.pdf
• 49 CFR 391.41 (medical certificate): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-sec391-41.pdf
• 49 CFR Part 392 (driving rules): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-part392.pdf
• 49 CFR Part 393 (brakes, cargo securement): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-part393.pdf
• 49 CFR 395.3 (hours of service): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-sec395-3.pdf
• 49 CFR Part 396 (inspection): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-part396.pdf
• 49 CFR Part 397 (HazMat driving): https://www.govinfo.gov/content/pkg/CFR-2025-title49-vol5/pdf/CFR-2025-title49-vol5-part397.pdf

DISCLAIMER
Rigvo is an independent study app. It is not affiliated with, endorsed by or connected to FMCSA, AAMVA, the U.S. Department of Transportation or any state DMV or licensing agency, and it does not provide government services. Test length, pass marks and some rules differ by state.

Questions or feedback: [email protected]