reading the signal…
Signals / Object / Street-level imagery
in Atlanta, GA·counted·2.4K all time
An underpass is a passage beneath a road, railway, or other structure, often used by vehicles or pedestrians.
Counted, not streamed: Underpass 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.