North Carolina CDL License Written Test Practice

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1. What does a flashing yellow traffic light mean?

• Stop completely and wait for it to turn green
• Slow down and proceed with caution ✓
• Speed up to clear the intersection
• Treat it as a stop sign

Explanation: A flashing yellow light warns you to slow down and proceed with caution — it does not require a full stop.

2. What is the legal blood alcohol concentration (BAC) limit for a non-commercial adult driver in most states?

• 0.04%
• 0.08% ✓
• 0.10%
• 0.12%

Explanation: In nearly all states the legal BAC limit for a non-commercial adult driver is 0.08%.

3. When can you legally drive using only your parking lights?

• At dawn and dusk only
• When driving in a well-lit area
• Never — parking lights are for parked vehicles only ✓
• When following another vehicle at night

Explanation: Parking lights are for parked vehicles only. You must use your headlights when driving in the dark or in low visibility.

4. A solid white line between lanes of traffic means:

• You may change lanes at any time
• Lane changes are discouraged — do not change lanes across it ✓
• It is a bike lane
• You must stop before crossing

Explanation: A solid white line means lane changes are discouraged or prohibited depending on the state — do not cross it unless necessary.

5. What should you do when approaching a school bus with flashing red lights?

• Slow down and pass carefully
• Stop and wait until the lights stop flashing ✓
• Honk to alert the driver
• Pass on the right side

Explanation: When a school bus flashes red lights, you must stop and wait until the lights stop flashing, regardless of your direction of travel (except on divided highways in some states).