If the traffic lights are red, the traffic must stop.
如果交通灯变为红灯，车辆必须停止。
The traffic lights were on red.
当时是亮红灯。
You must stop at the traffic lights when they are red.
红灯亮时，你必须在交通灯前停下。
Why traffic lights are red, yellow and green？
为什么交通灯是红、黄、绿三种颜色的？
If the traffic light is red, you must stop.
如果交通灯是红色的，你必须停止前进。
Don't cross the street when the traffic light is red.
当交通灯是红色的时候，不要横过街道。
If you are looking at your phone while walking, you might not see a car come or traffic lights turn red.
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。
现在是红灯。
The red traffic light made me stop.
红灯让我停了下来。
The traffic must stop when the red light is on.
当红灯亮时，车辆必须停下来。
Traffic lights go from red to yellow.
红灯灭了，黄灯亮了。
As for red, it is the color which usually shows warning, as a result, some traffic signs use this color.
至于红色，它通常是表示警告的颜色，因此，一些交通标志会使用这种颜色。
The red traffic light indicates that every person and vehicle must stop.
红色信号灯表示人和车辆不能通行。
The traffic light at the next corner turned red, but he whipped right at the corner without slowing.
下一个路角的交通信号灯转成了红色，但是他毫不减速在路角猛力右转。
Green, as opposed to red, means safety; it is the color of free passage in road traffic.
绿色，与红色相反，意味着安全性；它是道路交通中自由通行的颜色。
But then Jobs made what seemed like an odd suggestion: that the buttons should be colored like traffic stoplights: red to close the window, yellow to shrink it, and green to expand it.
但之后乔布斯又做出了一个看起奇怪的决定：按钮要按照交通信号灯那样上色：红色表示关闭窗口、黄色表示缩小窗口、绿色表示放大窗口。
SignalGuru is designed to detect traffic lights and track their status as red, amber or green.
“信号导师”设计用于探知交通信号灯并追踪其状态，如红黄绿色。
Red is widely used to indicate danger (high voltage signs, traffic lights).
红色广泛用于指示危险(高压电警示、交通灯)。
Using this information, SignalGuru is able to calculate the traffic-light schedule for the region and suggest the speed at which a driver should travel in order to avoid running into red lights.
利用这些信息，“信号专家”就可以计算出一个区域的交通灯时刻表，并为驾驶员建议可供参考的行驶速度，避免在交通路口遭遇红灯。
Though you might curse them at every red light, city planners do try to synchronize traffic signals to improve flow, even relying on supercomputers to design the optimal patterns.
虽然每当你遇到一个红灯路口，心里有可能会暗暗诅咒，但城市规划者们确实在努力提高交通流畅程度，他们尝试让多盏信号灯实现同步，甚至依靠超级计算机来设计的最佳模式。
Though you might curse them at every red light, city planners do try to synchronize traffic signals to improve flow, even relying on supercomputers to design the optimal patterns.
虽然每当你遇到一个红灯路口，心里有可能会暗暗诅咒，但城市规划者们确实在努力提高交通流畅程度，他们尝试让多盏信号灯实现同步，甚至依靠超级计算机来设计的最佳模式。
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