CDL Prep: All 50 States

DISCLAIMER: This app does not represent a government entity.
CDL Prep is an independent study tool developed by M4 Infotech. It is not affiliated with, endorsed by, authorized by, or in any way officially connected with the Federal Motor Carrier Safety Administration (FMCSA), the U.S. Department of Transportation (DOT), or any state Department of Motor Vehicles (DMV), Department of Public Safety (DPS), or state licensing agency.

Prepare for your Commercial Driver's License (CDL) written knowledge exam and Commercial Learner's Permit (CLP) with comprehensive, cited practice tests and study guides.

WHAT THIS APP PROVIDES:
• Practice test banks covering General Knowledge and all endorsements: Air Brakes, Combination Vehicles, Hazardous Materials (HazMat), Tanker, and Doubles & Triples.
• Clear explanations for every question explaining why the correct answer is right and why other options are incorrect.
• Handbook citations referencing relevant sections so you can verify answers directly in the source material.
• Timed mock exams scored at the standard 80% passing threshold.
• Mistakes review mode to practice and drill questions you missed.
• Offline study support — works in truck cabs, terminals, and remote yards without active mobile data.

SOURCES OF GOVERNMENT INFORMATION:
All regulatory information, safety rules, and practice questions in CDL Prep are derived directly from publicly available federal standards and state commercial driver licensing manuals:

1. Primary Federal Regulations:
• Federal Motor Carrier Safety Administration (FMCSA) CDL Program:
https://www.fmcsa.dot.gov/registration/commercial-drivers-license
• Code of Federal Regulations (Title 49 CFR Part 383):
https://www.ecfr.gov/current/title-49/subtitle-B/chapter-III/subchapter-B/part-383
• USA.gov Directory of State Motor Vehicle Services:
https://www.usa.gov/state-motor-vehicle-services

2. State Commercial Driver Handbooks:
• California DMV Handbook:
https://www.dmv.ca.gov/web/eng_pdf/comlhdbk.pdf
• Texas DPS Handbook:
https://www.dps.texas.gov/internetforms/Forms/DL-7C.pdf
• Florida DHSMV Manual:
https://www.flhsmv.gov/pdf/handbooks/englishcdlhandbook.pdf
• New York DMV Manual:
https://dmv.ny.gov/driver-license/commercial-drivers/new-york-state-commercial-drivers-manual
• Pennsylvania PennDOT Manual:
https://www.pa.gov/content/dam/copapwp-pagov/en/penndot/documents/public/dvspubsforms/bdl/bdl-manuals/commercial-drivers-manual/pub223.pdf
• Illinois SOS Guide:
https://www.ilsos.gov/publications/pdf_publications/dsd_cdl10.pdf
• Ohio BMV Manual:
https://publicsafety.ohio.gov/static/hsy7605.pdf
• Michigan SOS Manual:
https://www.michigan.gov/-/media/Project/Websites/sos/Resources/Forms-and-publications/CDL-Manual/cdlmanual.pdf
• Georgia DDS Manual:
https://dds.georgia.gov/media/12646/download
• North Carolina DMV Manual:
https://www.ncdot.gov/dmv/license-id/driver-licenses/new-drivers/Documents/commercial-driver-manual.pdf
• Washington State DOL Guide:
https://dol.wa.gov/media/pdf/42/cdlguidepdf/download

Complete directory of all state commercial driver handbooks:
https://cdl.m4infotech.com/sources/

ABOUT CDL PREP:
CDL Prep is an independent study tool designed solely to assist applicants in studying for state-administered commercial driver knowledge exams. This app does not issue licenses, schedule road tests, or certify commercial driving qualifications. Official testing and license issuance are conducted exclusively by your state's motor vehicle licensing authority.