Oregon CDL General Knowledge Practice Test 2025

The Oregon CDL General Knowledge test has 50 questions requiring 40 correct (80%) to pass. 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 Oregon DMV for current testing fees and schedules.

Oregon CDL holders in a CMV face the federal 0.04% BAC DUII limit. Oregon calls the offense DUII and covers cannabis impairment without a per se THC level — officer observation of impairment is the standard. A DUII conviction in any vehicle triggers FMCSA CDL disqualification: 1 year for first offense, lifetime for second. Oregon DMV reports DUII convictions to FMCSA within the required 10-day window.

ODOT's chain control on Cascade passes (Santiam Pass US 20, McKenzie Pass OR 242, Diamond Lake Jct OR 138, Crater Lake access): (1) 'Chains Required' signs are legally enforceable — all CMVs must comply; (2) mandatory truck check stations on both sides of major passes verify compliance; (3) CDL trucks that cannot be fitted with chains must wait at the check station; (4) monitor ODOT TripCheck at tripcheck.com before any Cascade mountain route in fall/winter/spring; (5) chain control is separate from road closures — a closed road means no vehicles, while chain control means chains required for compliance.

Oregon CDL skills tests are administered at ODOT-approved Third Party Testing sites. Knowledge tests are available at Oregon DMV driver license offices statewide. Oregon has CDL testing in Portland, Salem, Eugene, Medford, Bend, Klamath Falls, and other cities. Contact Oregon DMV for current Third Party Tester locations and scheduling.

Oregon OS/OW permits are issued by ODOT for loads exceeding: 14 feet tall, 8'6" wide, 75 feet long (combination), or 80,000 lbs GCVW. Oregon's permit system specifies: approved routes (not all Oregon roads are approved for all oversize loads); travel time windows (typically daylight hours only; no travel during rush hour in the Portland Metro or Salem); escort vehicle requirements (one front escort for widths 12-14 feet, two escorts for 14+ feet); and flagger requirements for some moves. Oregon's coast, mountain, and valley regions each have specific bridge clearance and weight restrictions that affect OS/OW route planning.

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 Oregon 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 Oregon DMV for available language options.

In most states, a CDL is valid for 4–8 years (commonly 4–5 years). To renew your Oregon 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 Oregon, 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.