bicycle routing seems broken. Speeds are very wrong

[viktorras]

The speed used for cycling seems very wrong for some routes

Two examples from the same park:
https://routing.openstreetmap.de/routed-bike/route/v1/driving/12.50761,55.63569;12.5154,55.63624?overview=false&geometries=polyline&steps=true
uses a speed of 4 km/h on a very nice gravel bicycle path (18 km/h would be realistic)

https://routing.openstreetmap.de/routed-bike/route/v1/driving/12.50761,55.63569;12.5154,55.63624?overview=false&geometries=polyline&steps=true
uses a speed around the speed of sound (1176 km/h) on a similar gravel path

This bug results in some very weird routing in the area

[jcoupey]

This may be another occurrence of #7258.

[viktorras]

I just noticed that I pasted the same URL twice. Sorry.
This one shows the problem with the very high speed (speed = 914 km/h)
https://routing.openstreetmap.de/routed-bike/route/v1/driving/12.501546,55.631668;12.50253,55.630672?overview=false&geometries=polyline&steps=true

I have changed the surface on the nice bicycle path from gravel to compacted. And now it shows a speed of 14 km/h which is much better.
I guess someone should go through all bicycle routes in Denmark and make sure the surface is set to fine_gravel or compacted. Otherwise routing times will be very wrong.

[viktorras]

I have now made a local installation osrm.
And the result is different. The url above gives a speed of 10km/h.
So I guess the problem is introduced by the routing.openstreetmap.de server.
Which is the default routing server when I go to osm.org