[itsmartapuntocm]

I see them everywhere in Metro Atlanta. You can tell because there’s what looks like a little camera above each direction facing traffic light.

[mh-]

If you're talking about the ones I think you are, those are preemption signal devices [0] for emergency vehicles.

[0]: https://ops.fhwa.dot.gov/publications/fhwahop08024/chapter9....

[itsmartapuntocm]

No these aren’t optical sensors like those, they’re full blown cameras.

Cobb County at least on their website says they use camera sensors as well as buried induction loops.