So new traffic signals emerged in various forms.

新的交通信号灯以各种形式出现。

These three buttons look like traffic signals, don't they?

这三个按钮看起来像交通信号，不是吗？

A green light on a traffic signal means your car can continue on.

交通信号灯亮绿灯表示你的车可以继续行驶。

But often they just pass by, taking the human traffic signal for granted.

司机通常会驶过，把人体交通标志当做理所当然。

By 1922 many traffic signals were being automated on timers.

到1922年，许多交通信号灯有了倒时。

So officials have created what they say is the first traffic signal for, you get it, camels.

所以官员们创造了所谓的第一个为骆驼建造的交通信号灯。

Lester Wire, a policeman in Salt Lake City, Utah created the electric form of the traffic signal.

在犹他州盐湖城，一位名叫莱斯特的警察发明了使用电力的红绿灯。

Well, think about how a traffic signal manages traffic.

好吧，想想交通信号如何管理交通。

C. Flexible timing of traffic signals.

C. 交通信号的灵活配时。

A traffic signal is not efficient at all.

交通信号有效率。

Especially when you compare a roundabout to an intersection with traffic signals.

尤其是当您将环岛与有交通信号的十字路口进行比较时。

So another way you'll know when to stop is when you see a stoplight or a traffic signal.

，您知道何时停止的另一种方式是当您看到红绿灯或交通信号灯时。

But usually a traffic signal would be at an intersection, where two streets cross.

但通常交通信号灯会在十字路口，两条街道交叉的地方。

On December 9th, 1868, the world's first traffic signal was installed near Westminster Bridge at the corners of Great George and Brige streets.

1868年12月9日，首个交通信号灯安装在了威斯敏斯特大桥附近，位于乔治街和布里奇街的拐角处。

This, of course, was usually on corners or intersections where there was no traffic signal, no electronic signal to stop cars.

当然， 这通常是在有交通信号的拐角处或十字路口，有电子信号可以停车。

The Federal Highway Administration, they estimate that traffic signals account for about 295 million vehicle hours of traffic delays per year.

美国联邦公路管理局估，交通信号灯每年造成约 2.95 亿车小时的交通延误。

That could be in the middle of a long block, and that might also have a traffic signal in some places.

那可能在一个长街区的中间，并且在某些地方也可能有交通信号。

Cesar drove around the block so the examiner could check to see that he stopped at the stop signs and traffic signals.

塞萨尔绕着街区开车，这样考官就可以检查他是否停在了停车标志和交通信号灯处。

The examiner had me drive around the block, checking to see that I stopped at the stop signs and traffic signals.

考官让我绕着街区开车，检查我是否停在了停车标志和交通信号灯处。

Why " green-light? " Well, of course, in a traffic signal, the green light indicates that you can go, that you can move forward.

为什么是“绿灯” ？ 嗯，当然，在交通信号中，绿灯表示你可以走， 你可以前进。