Bicycle Master Plan is a bike map that allows visualizing cycling related data from different sources in multiple layers. Built heavily around data from OpenStreetMap, it allows full visual customization using CSS.
This could be accomplished with a new marker layer. Green dots could be placed on nodes that are tagged with highway=crossing and bicycle=yes or bicycle=designated. Red dots could be placed on nodes that are tagged with highway=crossing and bicycle=no.
I believe it would be useful to visualise crossings that allow bicycles to be ridden across.
Here is an example
https://www.openstreetmap.org/node/273179081
This could be accomplished with a new marker layer. Green dots could be placed on nodes that are tagged with highway=crossing and bicycle=yes or bicycle=designated. Red dots could be placed on nodes that are tagged with highway=crossing and bicycle=no.