I hate to break it to you but the state police and most toll road authorities have put an entire network of cameras on every major interstate and road system to be able to track cars.

Even outside the US this is true. I live in Lithuania and a couple years ago I started noticing cameras along the side of most highways. They've now started using them to enforce average speeds, but to everyone here it should be pretty clear they are tracking the movements of vehicles (whether intentional or not is a different question).

A lot of other European countries have automated toll roads (sometimes just for HGVs) which do the same thing.

One of the upshots at least of living in countries other than America that follow its worst practices are that they're generally much worse in execution, i.e. they end up making it obvious

So that's good at least

If that were true would there still be a need for amber alert?

Yes because cameras do not cover all parts of every road.

I don't live in America :P

Looks like you're from Wales. Here's a great national site that you can see the live traffic cameras:

http://www.traffic-wales.com/?lang=en-GB

Just filter the map by CCTV and choose the icon to view the live video.

Enjoy!

Seems like a single photo only for each camera, no "live"?

Most developed countries have similar systems in place. Heck, I'd wager that the US is lagging behind other countries in this area, primarily due to its size.

What is this list of most countries? I am certain this is illegal in Sweden, for example.

About 5 seconds of googling yielded these street cameras in Sweden:

https://trafiken.nu/goteborg/Kameror/Alla-Kameror/

http://www.webbkameror.se/trafikkameror/trafikkameror_kalm_1...

Also...

https://www.wired.com/2010/12/swedish-speed-camera-pays-driv...

Having cameras and having an effective tracking system based on them is a big difference. (No idea about the swedish situation, but in Germany proposals to give police access to information from traffic enforcement cameras for criminal cases have been a huge topic)

If I can access the feed I can build a tracking system (how effective it is, is always a big variable).

No, but there are plenty of cameras in South Wales.