reading the signal…
Signals / Object / Street-level imagery
in Cincinnati, OH·counted·50 all time
A siren is a device producing a loud warning sound, typically appearing as an alarm unit or emergency vehicle light.
Counted, not streamed: Siren has no time series, so it is read as a footprint across places. All-time count by city.
Things that physically exist: street furniture, signs, buildings. All-time counts.