In most places in the world, a green light is a signal to move ahead.

VOA: special.2010.05.23

It's no use talking about the negative relationship between a red light and a green light and a yellow, white, or blue one because they all have the same value.

讲什么它是红灯，不是绿灯,不是黄灯白灯一点关系都没有,它们所代表的意义都一样。

耶鲁公开课 - 文学理论导论课程节选

In everyday speech, a green light means approval to continue with a project.

VOA: special.2010.05.23

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

VOA: special.2010.05.23