Yes, those are legal, but pretty much limited to law enforcement and paid parking lots. Since police can't issue citations based on video evidence alone, they're not nearly as common here as elsewhere. Private businesses could probably grab that from security cameras (e.g. gas stations), but that should, in most cases, require a subpoena.

I rarely go places where license plate readers are common, so those data points are pretty few and far between. If I was running from the law, I'd certainly act differently, but the police have no reason to request a subpoena, so I'm unlikely to be tracked.

It is possible though, and I really don't like that. But it's just not likely.