Many in the environmental community like the fact that because traffic isn't stopped, like it is at a traditional signalized intersection, you don't have vehicles idling and therefore the emissions from those idling vehicles is less.

环保界的许多人都喜欢这样一个事实：因为交通不会像传统的信号交叉口那样停止，所以不会有车辆空转，因此这些空转车辆的排放量较少。