A brief history of the traffic light and why we need a new colour
![](https://www.fgnnews.com/wp-content/uploads/2022/11/Bills.vresize.40.40.medium.0.png)
The design has barely changed in 100 years but, now, self-drive vehicles may need a fourth colour.
The design has barely changed in 100 years but, now, self-drive vehicles may need a fourth colour.