当交通灯是黄色时汽车没有停下来。
等待交通灯变换颜色。
交通灯已由红变绿。
红灯亮时，你必须在交通灯前停下。
为什么交通灯最初要选择这些颜色呢？
Why were those colors chosen for traffic lights in the first place?
红色交通灯表示你必须停车。
如果交通灯是红色的，你必须停止前进。
当交通灯是红色的时候，不要横过街道。
为什么交通灯是红、黄、绿三种颜色的？
如果交通灯变为红灯，车辆必须停止。
当交通灯是绿色的时候，你可以穿过街道。
You can walk across the street when traffic lights are green.
你能看到交通灯了吗？
中央计算机控制交通灯，现在让学生们先走。
The central computer controls the traffic lights, now let the students go first.
你可以看看交通灯。
下个交通灯左转。
谁发明了交通灯？
你会看到交通灯。
1920年，世界上第一个三色交通灯投入使用。
In 1920, the world's first three-color traffic light was put to use.
例如，比较一下在一组交通灯前的英国司机和巴西司机。
Compare, for example, an English driver at a set of traffic lights with a Brazilian.
幸运的是她要过马路的时候交通灯转绿灯了，所以她成功了。
Luckily the traffic lights turned green as she was to cross the road, so she made it.
如果你边走边看手机，你可能看不到车辆开过来或交通灯变红。
If you are looking at your phone while walking, you might not see a car come or traffic lights turn red.
比如，为什么不在交通灯杆上安装监控摄像机来防止人们闯红灯呢？
Like if people jump the traffic lights, I don't know why there isn't a camera at the traffic lights to stop people from doing that.
例如，我不知道为什么不在交通灯杆上安装监控摄像机来防止人们闯红灯呢？
Like if people jump the traffic lights, I don't know why there isn't a camera of the traffic lights to stop people doing that.
事实上，如果他们完全能看到交通灯的话，他们会把它们看作是路边的一种装饰。
If, in fact, they see traffic lights at all, they regard them as a kind of roadside decoration.
交通灯附近的区域也同样比它们中间的区域温度更高，这是由于车辆停在车流中所造成的影响，而不是移动造成的。
Areas near traffic lights can be similarly warmer than the areas between them because of the effect of cars standing in traffic instead of moving.
德克萨斯农工大学交通研究所的研究工程师凯文·鲍克说，虽然智能交通灯对一些城市特别有帮助，但有些城市太拥挤了，只有大幅减少道路上的汽车数量才能有效改变拥堵的局面。
Kevin Balke, a research engineer at the Texas A&M University Transportation Institute, says that while smart lights can be particularly beneficial for some cities, others are so jammed that only a sharp reduction in the number of cars on the road will make a meaningful difference.
最近的交通灯在一个半小时车程以外。
直走到交通灯，然后在第一个路口左拐。
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