So, that standard four-way signalized intersection, it likely costs more than your house.

所以，那个标准的四路信号交叉口，它的成本可能比你的房子还要贵。

Altogether, those might run around $20,000 per signalized intersection.

总共，每个信号交叉口的费用可能约为 20,000 美元。

If we hold that to be true, we're looking at somewhere around 330,000 signalized intersections in the United States.

如果我们认为这是真的，那么我们正在观察美国大约 330,000 个信号交叉口。

Signalized intersections are definitely more familiar to people, so they've got a much wider public acceptance than roundabouts.

信号交叉口肯定是人们更熟悉的，因此它们比环形交叉口得到了更广泛的公众认可。

One group that Crockett has been burrowing in with lately is traffic engineers — the people responsible for designing, sourcing, building, and maintaining signalized traffic intersections.

克罗克特最近一直在研究的一个群体是交通工程师——负责设计、采购、建造和维护信号交通交叉口的人员。

It's hard to say exactly how many traffic lights there are in the U.S., but these engineers have a rule of thumb: there's roughly one signalized intersection per 1,000 residents.

很难确切地说美国有多少个交通灯，但这些工程师有一个经验法则：大约每 1,000 名居民就有一个信号交叉口。

But really, signalized intersections are designed for maximum efficiency, basically about an hour-and-a-half a day — maybe 45 minutes in the A.M. peak hour and 45 minutes in the P.M. peak hour.

但实际上，信号交叉口的设计是为了实现最高效率，基本上每天大约一个半小时——上午可能 45 分钟。高峰时段和下午 45 分钟繁忙时间。

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。