At 9:30 am, the full red/yellow/green signal cycle might be 140 seconds.

上午九点半的时候，完整的红黄绿信号灯变换周期大概为140秒。

youdao

Outside his boardroom he posted red and green lights to signal to his secretary whether visitors could enter.

他在会议室的外面用红光和绿光来暗示秘书是否该让来访者进来。

youdao

For them, the red and yellow signal is an indication to crawl the car and keep moving, while the green signal is to zoom past all the other cars.

对于他们而言，红灯和黄灯意味着要慢慢溜过去，而非停下来，绿灯则是要加大油门甩掉其它的车辆。

youdao

Using a specialized sub-pixel signal processing for Sharp's red-green-blue-yellow Quattron pixel panel, the next genesis of Quattron will allow the control and use of these colors individually, enabling the reproduction of double resolution in one singular pixel.

ENGADGET: Sharp AQUOS Ultra HD, 1080p HDTVs eyes-on HD

The red, green and blue components of the signal are fed into three separate high-definition cathode-ray tubes (in effect, fancy black-and-white televisions).

ECONOMIST: Curtains for celluloid

Dedicated lanes give buses an uncongested path, and traffic-signal priority gives buses the power, once reserved for emergency vehicles, to switch signals from red to green as they approach.

FORBES: Busting Bus Bunching With Traffic Signals