Search inside the imagery. On every corridor we have read, each scene is described frame by frame — objects, signage, surfaces, water, people — and each of those observations is searchable. Try “wooden bridge”, “stop sign”, “boat launch”, or pan the map and search the area.
Searching 75 corridors in 24 states · 28,893 scenes read so far. Reading rolls out corridor by corridor across 871,620 public 360° scenes, so a place that has not been read yet comes back empty here — that is coverage, not a failed search.