Where I live we already have cameras on larger street crossings for traffic management, and along every bus line, not to mention the ones in busses, metros and stations.

What is lacking is the fusion you mention. But with ubiquitous 5G it's only a matter of when, not if.

The smaller ones clipped onto the top of traffic lights look rather eyeborgian ( https://www.imdb.com/title/tt1043844/ )