reading the signal…
Signals / Condition / Street-level imagery
in San Mateo, CA·counted·223 all time
A pedestrian route without a sidewalk, typically showing a road edge directly beside grass, dirt, or buildings.
Counted, not streamed: Missing Sidewalk has no time series, so it is read as a footprint across places. All-time count by city.
The state of a place: complaints, wear, noise and upkeep. All-time counts.