Final answer:
You can safely return to the driving lane in front of a truck when the entire front of the truck is visible in your rear-view mirror, indicating sufficient distance for safety.
Step-by-step explanation:
It is safe to return to the driving lane in front of a truck when you can see the entire front of the truck in your rear-view mirror. This ensures that you have enough distance to re-enter the lane without causing the truck to brake abruptly. It’s important to give large vehicles like trucks plenty of space because they need a longer distance to stop due to their size and weight.
When deciding to pass a truck and return to the driving lane, you must also take into account the total distance the truck covers to stop and the reaction time of the truck driver if they have to hit the brakes. Always ensure there is ample space, which could be several car-lengths, to make such maneuvers safely.