The photo has at least three separate surveillance systems that don't talk to each other — but can be correlated after the fact.

The cameras are almost certainly FLOCK Safety LPR units. OCR every plate, real-time hot list alerts, data retained and licensed to law enforcement. deflock.org (already linked) maps the known network.

The white brick is a radar vehicle presence detector for traffic signal control — it replaced inductive loops cut into asphalt. Pure object detection, no identity data, not part of any surveillance network. SARGE had this right.

The layer nobody's mentioned: if you're carrying an EZPass or any RFID toll transponder, it broadcasts a unique ID to any reader in range — including private ones. The ACLU documented this years ago (bitteroldcoot's link). Your transponder doesn't know it's not a toll plaza.

Three separate data streams. The surveillance picture isn't one device — it's three systems that can be joined on timestamp and location after the fact by anyone with access to any one of them. The white brick is genuinely just traffic engineering. The other two aren't.