There is a 6th layer on osm.org now: CyclOSM. 👍
It provides several benefits over the existing Cycle Map layer. Among others, you can easily see roads with cycle lanes. And tiles appear to be regenerated more frequently too.
One more benefit: it shows streets with setts (bad stones, those are frequent in my city) in a different colour.
I also use this layer for Q/A, because it’s the easiest way to catch some mistakes in cycle tagging, for instance if a lane only exists on one side of the road but was tagged as cycleway=lane.
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