CDL General Knowledge TestDriving SafelyMedium
You are driving a commercial vehicle on a two-lane road and need to pass a slower vehicle. How much space should you ideally maintain between your vehicle and the vehicle you are passing before returning to your lane?
- AEnough space so you can see the front bumper of the passed vehicle in your side mirror.
- BAt least one car length for every 10 mph of speed.
- CEnough space so you can see the entire front of the passed vehicle in your side mirror.
- DEnough space so you can see the headlights of the passed vehicle in your rearview mirror.
Show answer & explanationAnswer & explanation
Correct answer: D. Enough space so you can see the headlights of the passed vehicle in your rearview mirror.
The general rule for safely returning to your lane after passing is to ensure you can see the headlights of the passed vehicle in your rearview mirror. This indicates sufficient clearance to avoid cutting off the other vehicle.
Why the other options are wrong
- A. Seeing only the front bumper in your side mirror means you are likely too close and could cut off the other vehicle.
- B. This rule applies more to following distance, not passing clearance.
- C. Seeing the entire front of the passed vehicle in your side mirror is generally insufficient; you need more space.
Safe Passing Clearance
When passing another vehicle, especially in a commercial vehicle, ensure you have enough space to safely return to your lane without cutting off the passed vehicle. A common guideline is to see the passed vehicle's headlights in your rearview mirror.
- Check mirrors before, during, and after passing.
- Signal clearly before changing lanes.
- Accelerate to pass quickly but safely.
- Ensure ample space before returning to the right lane.
Memory trick: Headlights in the mirror, then you're clear!