Oklahoma CDL — General Knowledge practice
Oklahoma CDL — General Knowledge: Traffic Laws practice test
Speed limits, turning and signaling rules, headlight and seat-belt requirements, and the everyday laws every driver must follow.
Content reviewed against official driver handbooks · August 12, 2026
14 questions · pass with 11 correct. You get instant feedback and an explanation after every answer.
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12 sample Traffic Laws questions with the correct answer, a short explanation, and the official handbook reference. Read through them, then take the quiz above.
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1. Reading or sending text messages while operating a commercial vehicle is...
Correct answer: Banned for CMV drivers
Texting behind the wheel of a CMV is banned; it distracts you mentally and physically at the same time.
Source: Oklahoma CDL Manual — Section 2: Driving Safely
2. Driving how far above the posted limit is treated as a serious traffic violation?
Correct answer: 15 mph or more
Excessive speeding of 15 mph or more over the posted limit is a serious violation.
Source: Oklahoma CDL Manual — CDL Disqualifications
3. While driving a CMV, using a hand-held mobile phone to talk is generally...
Correct answer: Prohibited by federal rules
Federal rules prohibit holding a phone to talk while operating a commercial motor vehicle.
Source: Oklahoma CDL Manual — Section 2: Driving Safely
4. In many states, the speed limit for trucks and buses can be lower than for cars by as much as...
Correct answer: 15 mph
Truck and bus limits are often lower than car limits, sometimes by as much as 15 mph, so use caution when changing lanes or passing.
Source: Oklahoma CDL Manual — Controlling Speed & Managing Space
5. When applying for a commercial driving job, how many years of driving-job history must you provide?
Correct answer: 10 years
You must give an employer information about every driving job you held during the previous 10 years.
Source: Oklahoma CDL Manual — Section 1: Introduction
6. When must a commercial driver wear a safety belt?
Correct answer: At all times while operating the vehicle
A safety belt must be worn the entire time you are behind the wheel of a commercial motor vehicle.
Source: Oklahoma CDL Manual — Section 1: Introduction
7. How many driver licenses may a commercial driver legally hold?
Correct answer: Only one
You may hold only one license; breaking this rule can bring a large fine or jail time.
Source: Oklahoma CDL Manual — Section 1: Introduction
8. Which of the following is classed as a serious traffic violation?
Correct answer: Following another vehicle too closely
Following another vehicle too closely is among the offenses defined as serious traffic violations.
Source: Oklahoma CDL Manual — CDL Disqualifications
9. If you are convicted of a traffic violation in another state, when must you notify your own licensing agency?
Correct answer: Within 30 days
A conviction in any other jurisdiction must be reported to your licensing agency within 30 days.
Source: Oklahoma CDL Manual — Section 1: Introduction
10. After the first 50 miles of a trip, how often must you re-check that your cargo is secure?
Correct answer: Every 150 miles or 3 hours, whichever comes first
You must re-check cargo securement after each 150 miles of travel or every three hours, whichever is sooner.
Source: Oklahoma CDL Manual — Section 3: Transporting Cargo Safely
11. After a conviction for a traffic violation other than parking, within how long must you tell your employer?
Correct answer: Within 30 days
You are required to notify your employer within 30 days of any such conviction, no matter what vehicle you were driving.
Source: Oklahoma CDL Manual — Section 1: Introduction
12. If your license says corrective lenses are required, driving without them is...
Correct answer: Illegal
When your license calls for corrective lenses, moving the vehicle without wearing them breaks the law.
Source: Oklahoma CDL Manual — Night, Fog & Winter Driving
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