When passing a large truck, you should
- move back into the lane when you can see the headlights of the truck in your rear view mirror ✓
- flash your high beam lights before you pull back into the lane
- move back when you can see the driver's door in your rear view mirror
- slow down as soon as you move back in front of the truck
Answer: A. move back into the lane when you can see the headlights of the truck in your rear view mirror
Move back into the lane only after you can see the truck's headlights in your rear-view mirror.
Why this is the answer
The handbook's large-vehicle section says that when you pass a big vehicle or change lanes in front of one, you should leave extra room before pulling in because big vehicles need longer to slow down. It gives a concrete check: you should see the truck's headlights in your rear-view mirror before you return to the lane, then keep your speed steady. That matches the answer about waiting for the headlights, not the driver's door.
Why the other answers are wrong
- B. flash your high beam lights before you pull back into the lane — Flashing high beams before pulling back is not part of the handbook's guidance for passing a large vehicle.
- C. move back when you can see the driver's door in your rear view mirror — The handbook does not use the truck driver's door as the sign that you have enough room; it points to the headlights in your rear-view mirror.
- D. slow down as soon as you move back in front of the truck — The handbook says to maintain your speed after re-entering the lane, so slowing down right after moving in front of the truck goes against that advice.
Remember it
Use the truck's headlights in your mirror as your signal that there is room to return to the lane.