Why? Because road rage, impatience and general irritation are massively reduced when you can actually see the time you have to wait. In China, not really understanding the principle behind this, they applied the same principle to green traffic lights.
为什么？因为公路暴力，焦躁以及一般的不耐 在你可以确实的看到需要等待的时间后会很大的减少。 在中国它们也同样为绿色的交通灯设置了这样设施， 我并不明白这样做的原理。