I’m not sure why they need a fourth signal. It seems like the main benefit is permitting faster & more dynamic transitions between go & stop, both for cars & pe

I’m not sure why they need a fourth signal. It seems like the main benefit is permitting faster & more dynamic transitions between go & stop, both for cars & pedestrians. If you’re confident enough that your routing / traffic signals are going to be respected by the AVs on the road, why not just use the green -> yellow -> red lights to signal what’s happening to the humans (with appropriately shortened yellows because you know the targeted AVs are going to stop), and still reap the benefits of your interconnected AVs for better traffic flow?