Oklahoma CDL — General Knowledge Exam Simulation
50 questions · 40 correct to pass. You won't see any feedback until you finish — just like the real test.
Oklahoma CDL — General Knowledge questions with answers
20 sample questions from the Oklahoma CDL — General Knowledge question bank — each with the correct answer, a short explanation, and the section of the official handbook it comes from.
1. A clue that a nearby driver may be impaired is...
Correct answer: Weaving across the road or drifting between lanes
Weaving across the road or drifting between lanes is a warning sign of an impaired or drowsy driver.
Source: Oklahoma CDL Manual — Section 2: Driving Safely
2. What does the white stop line painted before railroad tracks mark?
Correct answer: Where the front of a stopping vehicle must remain behind
It marks the point that the front of a stopped vehicle must stay behind while waiting at the crossing.
Source: Oklahoma CDL Manual — Railroad-Highway Crossings
3. What does the slow-moving-vehicle emblem seen on farm or construction equipment look like?
Correct answer: A red triangle with an orange center
Some naturally slow vehicles display a red triangle with an orange center to warn you they travel below normal speed.
Source: Oklahoma CDL Manual — Section 2: Driving Safely
4. A 40-foot vehicle traveling below 40 mph needs a following distance of about...
Correct answer: 4 seconds
At one second per 10 feet, a 40-foot vehicle needs about 4 seconds below 40 mph (5 seconds above 40).
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
5. If your driving privilege is suspended, revoked, or canceled, how soon must you inform your employer?
Correct answer: Within two business days
A driver must tell the employer within two business days of any suspension, revocation, cancellation, or disqualification.
Source: Oklahoma CDL Manual — Section 1: Introduction
6. How should you hold the steering wheel?
Correct answer: Firmly with both hands on opposite sides
Grip the wheel firmly with both hands on opposite sides so a curb or pothole can't tear it from your grasp.
Source: Oklahoma CDL Manual — Section 2: Driving Safely
7. About how much alcohol can the liver process in one hour?
Correct answer: About one-third of an ounce
In one hour the liver clears only about a third of an ounce of alcohol, less than a single standard drink.
Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving
8. You need a CDL to drive a single vehicle whose gross vehicle weight rating is at least...
Correct answer: 26,001 lbs or more
A single vehicle rated at 26,001 pounds or more calls for a CDL.
Source: Oklahoma CDL Manual — Section 1: Introduction
9. If a front tire blows out, what is the most important thing to do?
Correct answer: Keep a firm grip on the wheel with both hands
Keep a firm two-handed grip on the wheel; a blown front tire can wrench it right out of your hands.
Source: Oklahoma CDL Manual — Driving Emergencies
10. Approaching an emergency vehicle stopped on the shoulder, what should you do if it is safe?
Correct answer: Move into a lane not next to it and slow down
Move-over laws direct you to change into a lane away from the stopped emergency vehicle and slow down.
Source: Oklahoma CDL Manual — Section 2: Driving Safely
11. On a two-lane, two-way road, how should you place the warning devices?
Correct answer: Within 10 feet of the vehicle plus 100 feet ahead and behind
Set one within 10 feet of the vehicle and the others 100 feet ahead of and 100 feet behind it.
Source: Oklahoma CDL Manual — Communicating
12. Why are drivers of local delivery or step vans a hazard?
Correct answer: They may be rushing and step out or pull into traffic suddenly
These drivers are frequently rushing and can step out or steer into the traffic lane without warning.
Source: Oklahoma CDL Manual — Section 2: Driving Safely
13. When another driver seems eager to pass, what should you NOT do?
Correct answer: Signal to them that it is clear to pass
Do not signal or wave others to pass; if a crash results you could be blamed for it.
Source: Oklahoma CDL Manual — Communicating
14. When the red lights at a railroad crossing start to flash, what do they mean?
Correct answer: A train is coming and you must stop
Flashing red lights signal that a train is coming; you must stop and yield to it before proceeding.
Source: Oklahoma CDL Manual — Railroad-Highway Crossings
15. At 55 mph, the total minimum stopping distance is roughly...
Correct answer: 419 feet
With perception, reaction, and braking distance combined, a vehicle at 55 mph travels a minimum of about 419 feet.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
16. What is the top cause of injuries and deaths in roadway work zones?
Correct answer: Speeding traffic
In work zones, fast-moving traffic is the number-one source of injuries and deaths, so obey posted limits.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
17. In very hot weather, how often should you inspect your tires?
Correct answer: Every two hours or every 100 miles
Inspect tire mounting and air pressure after every two hours or 100 miles of driving in extreme heat.
Source: Oklahoma CDL Manual — Night, Fog & Winter Driving
18. When may a driver use a drug prescribed by a doctor?
Correct answer: When the doctor confirms it won't affect safe driving
You may use a doctor-prescribed drug if the doctor says it will not affect your ability to drive safely.
Source: Oklahoma CDL Manual — Alcohol, Other Drugs, and Driving
19. If a first alcohol offense happens while hauling placarded hazmat, you lose your CDL for at least...
Correct answer: Three years
The disqualification jumps to at least three years when the offense occurs in a vehicle placarded for hazardous materials.
Source: Oklahoma CDL Manual — CDL Disqualifications
20. With the controlled-braking method, how do you apply the brakes?
Correct answer: As hard as possible without locking the wheels
Press the brakes firmly, just short of locking the wheels, while keeping your steering inputs small.
Source: Oklahoma CDL Manual — Driving Emergencies