This is actually a footpath, not an "unknown road".
Footpath along river returning from Takadanobaba to Iidabashi
Added several smaller roads and updates in Saginuma area
Changed from track to unknown road
Alternative track to return from falls viewpoint to main road
Changed link between Yokohama and Kawasaki to residential road
Slight update of footpath between Yokohama and Kawasaki cities
Added footpath between Yokohama and Kawasaki cities