Traffic lights go from red to yellow.

红灯灭了，黄灯亮了。

youdao

Since yellow can be seen well at all times of the day, school zones, some traffic signs, and school buses continue to be printed yellow.

由于黄色在一天中的任何时候都可以清晰地被看到，所以学校区域、一些交通标志和校车继续被印成黄色。

youdao

Why traffic lights are red, yellow and green？

为什么交通灯是红、黄、绿三种颜色的？

youdao

As you approach the intersection, the traffic light above flashes yellow and you softly ease your foot onto the brake, coming to a nice, easy stop.

FORBES: She Negotiates Oscar Season: One Powerful Film You Should Know About

The traffic layer, which lights up in red, yellow and green depending on the amount of traffic, also was particularly helpful on the way back to New York.

WSJ: Review: iPhone Google Maps lags Android version

At some big intersections, cops in day-glo yellow vests directed traffic.

FORBES: New York City After Hurricane Sandy