Explicitly consider the scenario where there is exactly one tollbooth per incoming travel lane.

需要保证每一个进入收费广场的交通线路上都仅有一个收费亭.

If you're a Highway tollbooth operator, take a breath each time a white car comes through your lane.

如果你是高速公路收费站管理员，每当一辆白色的车经过的时候，放松呼吸吧。