> However, even ALPR doesn't show any devices for me
I've panned the map over several parts of the US, and see many ALPRs mapped in OpenStreetMap.
You can also use the 'Wizard' of Overpass turbo, and enter ""surveillance:type"=ALPR around Miami" (or any other city (e.g. your home town), with quotation marks around surveillance:type) and increase the `radius` in the query until you'll find some.
As an example, here are the ALPRs 25km around Miami: https://overpass-turbo.eu/s/2dVP
I've panned the map over several parts of the US, and see many ALPRs mapped in OpenStreetMap. You can also use the 'Wizard' of Overpass turbo, and enter ""surveillance:type"=ALPR around Miami" (or any other city (e.g. your home town), with quotation marks around surveillance:type) and increase the `radius` in the query until you'll find some. As an example, here are the ALPRs 25km around Miami: https://overpass-turbo.eu/s/2dVP