Boston and other cities have piloted tested AI-controlled stop lights and found that they can reduce “stop and go traffic”. This seems encouraging to me, but not very imaginative and I hope this is not the end of the story. Stop lights are such an old technology, and it seems to me that with modern LED lights and screens we should be able to do much better. Each traffic lane, including lanes dedicated to light and un-motorized vehicles, need their own signals. Let’s get rid of the colored circles and make every single traffic light a series of arrows, so that we can control who is allowed to go forward entirely separately from who is allowed to make a turn from each lane. Pedestrians also need their own signals, and the heavy/highway vehicles, light/unmotorized vehicles, and pedestrians must never, ever have signals that put them in the same space at the same time. I won’t buy the idea that this would be “too expensive” – I happen to be traveling in a middle income country at the moment and I see a lot more arrows and countdown timers on traffic lights compared to what we have in the U.S. (although the jurisdiction I am in is no traffic safety utopia for sure.) If this sounds like it would be too inefficient with today’s system, this is where AI should come in and make it efficient and safe, at each individual intersection and for the system as a whole.

Another level of science fiction would dispense with the lights and screens, and embed them in our vehicle windshields, augmented reality glasses, headphones, etc. Vehicles that are entirely computer controlled, of course, can just get their signals from cellular or wireless networks. We are not there yet at least when it comes to widespread access/adoption of these technologies, but the technologies themselves either exist or are on the horizon.