Oklahoma CDL General Knowledge study guide
Oklahoma CDL General Knowledge · Work through your exam, one topic at a time.
The Oklahoma CDL General Knowledge test is the written knowledge exam that anyone applying for a Commercial Driver License in Oklahoma must pass before moving on to the skills and road portions of licensing. It is designed for drivers who intend to operate Class A, Class B, or Class C commercial vehicles - tractor-trailers, straight trucks, tank vehicles, and certain passenger or hazardous materials operations - and it tests whether you understand the safety rules and vehicle systems that apply across all of them. The Oklahoma CDL General Knowledge study guide has 10 sections and about 2,918 words.
01Driving Safely
Driving Safely covers the judgment calls the Oklahoma CDL exam expects from a working driver: legal limits on alcohol and hours of service, railroad crossings, fatigue, aggressive drivers, and driving in bad weather or at night. A CDL holder is under the influence at 0.04% BAC - half the 0.08% limit for non-commercial drivers.
329 words, about 2 min02Transporting Cargo Safely
Transporting Cargo Safely tests whether you can load, secure, and re-check freight so it does not shift, fall, or overload an axle. The combined working load limit (WLL) of all tiedowns must be at least 50% of the cargo weight.
298 words, about 1 min03Air Brakes
Air Brakes is a separate written and skills test, but the General Knowledge exam still expects you to explain how the system builds, holds, and loses pressure. An engine-driven compressor charges the tanks.
309 words, about 2 min04Combination Vehicles
Combination Vehicles tests the coupling, inspection, and handling differences that make a tractor-trailer unforgiving when something is missed. Back under the trailer, listen for the click, then do two tug tests with the trailer spring brakes set.
299 words, about 1 min05Vehicle Inspection
Vehicle Inspection tests the pre-trip routine and the brake checks that the skills test will ask you to demonstrate and explain. Vehicle overview, engine compartment (oil, coolant, belts, hoses, steering), cab and controls, signal lights, walk-around, brake tests, and final checks.
272 words, about 1 min06Basic Control of Your Vehicle
Basic Control of Your Vehicle covers the low-speed, high-consequence moves: starting, backing, turning, parking, and recovering from a skid or brake fade. Back toward the driver's side so you can see, and get out and look when unsure.
304 words, about 2 min07Shifting Gears
Shifting Gears tests whether you can keep the engine in its power band without abusing the clutch or losing control of the vehicle. Use the clutch only to start, stop, and shift.
274 words, about 1 min08Seeing and Communicating
Seeing and Communicating is about the information loop: what you look at, how often, and how you tell other drivers what you are about to do. Look 12–15 seconds ahead in the city and a quarter mile or more on the highway.
297 words, about 1 min09Space Management and Speed Control
Space Management and Speed Control is the domain where the exam expects you to calculate, not just recite. Following distance for a CMV is measured in seconds, not car lengths.
262 words, about 1 min10Hazardous Materials and Emergency Response
Hazardous Materials and Emergency Response covers the endorsement-level rules and the first five minutes of an incident. Nine classes: 1 explosives, 2 gases, 3 flammable liquids, 4 flammable solids, 5 oxidizers, 6 toxic, 7 radioactive, 8 corrosives, 9 miscellaneous.
274 words, about 1 min