This actually exists in many cities around the world like Dubai. Probably not every roadway, but almost all major ones.
London has had ANPR throughout the city for 15 years, and shortly after it went live in London, the system started being rolled out across the country. Now most police cars have real time ANPR systems, and all police forces have access to track cars in real time across the country. [0]
Recently the police have been 'trialing' facial recognition devices in public locations, however given people are more concerned about privacy than they were 10 years ago, I wouldn't be surprised if they have a much more active system than they make out. [1]
[0] https://en.m.wikipedia.org/wiki/Automatic_number_plate_recog...
[1] https://www.independent.co.uk/news/uk/home-news/facial-recog...
Even if they didn't, it'd probably save lives. Fatalities are so much more common at higher speeds, we could all stand to slow down a bit on the road.