"From Shimanto to Matsuno, along Route 381, there is a proper bike path (I rode on it).
Most of the time, it runs along a well-maintained sidewalk on either the right or left side of the road (even in the tunnels!).

It would be great if the route were marked as a bike path all the way through; that would make it easier to plan routes."
OSM snapshot date: 2025-12-14T02:16:23Z
POI name: 国道381号
POI types: highway-trunk
 #organicmaps android 2026.02.20-1-Google