That means that if there are five cars waiting, you have to wait till they all go, then you go. It lacks the notion of alternating, or taking turns, and it's always on the minor road, allowing the major one to have primacy.
就是说，要有5辆车等，你也得等 直到那5辆车开了，你才能走， 没什么换道啊，转弯啊 通常主干道有 优先权