Oklahoma CDL General Knowledge Practice Test 2025

The Oklahoma CDL General Knowledge test has 50 questions requiring 40 correct (80%) to pass. Oklahoma endorsement tests: HazMat (30 questions), Tanker (30 questions), Passenger (20 questions), School Bus (20 questions), Doubles/Triples (20 questions), Air Brakes (25 questions). All require 80%. Contact Oklahoma DPS for current testing fees.

Oklahoma CDL holders in a CMV face the federal 0.04% BAC DUI limit. Oklahoma's zero-tolerance law (0.00% BAC) for under-21 operators extends to CDL holders under 21 — any detectable alcohol is a DUI. A DUI conviction in any vehicle triggers FMCSA CDL disqualification: 1 year for first offense, lifetime for second. DPS reports all DUI convictions to FMCSA within 10 days.

Oklahoma DPS tornado guidance for CDL drivers: (1) NEVER shelter in the CMV cab — the vehicle provides no tornado protection and can roll; (2) NEVER shelter under an overpass — venturi effect is lethal; (3) exit the vehicle immediately; (4) move away from the truck; (5) find the lowest ground — roadside ditch, depression, culvert; (6) lie flat face-down; (7) cover head and neck with arms. Prevention: monitor NOAA weather radio during Oklahoma spring/fall; know the sky indicators of tornado formation (wall clouds, lowering funnels, green-hued sky).

Oklahoma oilfield equipment transport commonly requires ODOT OS/OW permits for: overwidth well production equipment (tanks, separators, skid packages); overheight drilling rig sections; overweight crude oil transport (some frac water trucks with specialized configurations); long-reach reach-boom equipment. Permits specify approved routes, time windows (daylight, no weekends for some wide loads), and escort vehicle requirements. Many Oklahoma county lease roads have weight restrictions significantly below federal limits — CDL drivers accessing oilfield leases must know county road weight postings.

Oklahoma CDL skills tests are administered at DPS-approved Third Party Testing sites. Knowledge tests are available at Oklahoma DPS Driver License Examining offices statewide. Oklahoma has CDL testing in Oklahoma City, Tulsa, Lawton, Enid, Muskogee, and other cities. Contact DPS for current approved testing site lists and scheduling.

A Class A CDL allows you to operate any combination of vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 lbs or more, provided the towed unit exceeds 10,000 lbs — this includes tractor-trailers and double/triple trailer rigs. A Class B CDL covers single vehicles with a GVWR of 26,001 lbs or more, or any such vehicle towing a unit not exceeding 10,000 lbs — this includes straight trucks and large buses. A Class C CDL is required for vehicles designed to carry 16 or more passengers (including the driver) or for vehicles transporting hazardous materials that require placarding, when those vehicles do not qualify for Class A or B.

CDL fees vary by state and by the class and endorsements you obtain. Most states charge separate fees for the CDL knowledge test ($10–$30 per attempt), the CDL skills test ($50–$150), and the CDL license itself ($50–$100). Additional fees apply for each endorsement (HazMat, Tanker, Passenger, etc.). The HazMat endorsement also requires a TSA security threat assessment fee of approximately $86. Check your Oklahoma DMV website for current fee schedules.

Federal regulations (49 CFR 383.133) require that CDL applicants be able to read and speak the English language sufficiently to understand highway traffic signs and signals and to respond to official inquiries. Many states offer CDL knowledge tests in Spanish and other languages for non-commercial knowledge questions, but the actual CDL test must be taken in a language that allows the driver to meet the English proficiency requirement. Check with the Oklahoma DMV for available language options.

In most states, a CDL is valid for 4–8 years (commonly 4–5 years). To renew your Oklahoma CDL, you typically need to visit a DMV office, pass a vision test, pay the renewal fee, and update your medical certification (DOT physical). If you hold a HazMat endorsement, your TSA background check must also be current. CDLs cannot generally be renewed online due to federal requirements for in-person verification of medical certification.

If you fail the CDL General Knowledge test in Oklahoma, you are typically required to wait a specified period (commonly 1–7 days) before retaking it. Most states allow 2–3 attempts before requiring additional waiting periods or study requirements. There is usually a retest fee for each attempt. Focus on the areas you missed — most states provide a score sheet showing which topic areas you need to review.