Traffic Laws

Study questions with answers

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.

1. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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. 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