We've had traffic lights like that in the UK for ages. Where I am in the States these days, they're very common. There's one very effective one that manages m

We've had traffic lights like that in the UK for ages. Where I am in the States these days, they're very common. There's one very effective one that manages my turning from the residential street onto to the main road. I was getting irritated at the weekend because I came across some lights that didn't have sensors. 5 cars stuck waiting at the lights for literally no one. Of course, the other thing they do in the UK is use small roundabouts, that can handle a fair amount of traffic nice and smoothly.