> This can be handled by looking at 
> roads/cycleways building relation,
> right?

Not really, the good metrics here would rather be the traffic (amount of
traffic, type of motor vehicles, destination) rather than the underlying
infrastructure and OSM at the moment has no such tagging possibility.

In other words, a small residential street with low max speed (30 km/h
or less) and only local traffic does not need any dedicated
infrastructure for safe cycling. But the same street, with the same
legal max speed but being a main transit axis in the city is a nightmare.

Same apply in urban areas.
https://www.openstreetmap.org/relation/9866054#map=14/45.6545/-0.8889
for instance is using a lot of roads with no infrastructure and a
maxspeed of 80km/h. It is however perfectly fine for touring since there
are signs along the route and the roads have very little traffic meaning
you are very safe there on your bicycle.

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