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It really reminds me of https://trailrouter.com/ which I've found amazing for finding new running routes.
It would be amazing to have similar functionality to suggest cycling routes of a certain distance that are mostly on bike trails i.e. suggest to me a 40km circular/out-and-back bike route from my house.
`Error fetching route from Graphhopper Error: Network response was not ok`
I tried a couple times and got this in the U.S. In Europe I picked a couple random points and it worked fine.
One of the most frustrating things for me with snapping to official paths is not being able to modify it for common workarounds (for instance, going across the Golden Gate bridge, everyone takes a shortcut through a parking lot, but every map routing platform I have used forces me to go the official route and messes up my nav)
I added a similar feature to cycle.travel (my site) a few months back. 5% of the work was writing the code to route only on waymarked routes, 95% was writing code to "heal" the accidental breaks in OSM bike route data...