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Things are different in france. Any bike path and quiet route will be on rwgps so it is your best bet. In my recebt experience, anything that will be bike-ready will be shown on the osm cyclemap layer.
However in france there are no bridleways and connectable right of ways to speak of, as landownership is different. You can venture on footpaths, forest and farm tracks, but potentially can be booted out as that will be private.
GR (grande randonnée) pathways which are long distance pedestrian hiking trails are not designed for bikes.
Route planning for gravel riding in Brittany. What are the local rules on what is/isn't ridable, and what are the best resources for planning a ride? My UK go-to is ridewithgps combined with OS maps. The former obviously covers France but doesn't seem to mark bridleways. Are footpaths fair game over there?