It might be worth adding a photo of a “mini” zebra crossing on a cycle track, as they look a bit like informal ones (no Belisha beacons, zigzags, or dots).
Raised crossings could probably do with traffic_calming=table|hump + surface=*
An entry for continuous “Copenhagen” crossings would be useful - these should have crossing:continuous=yes and a separate highway=give_way node on the side road before the crossing.
I see via Taginfo that you have started using crossing_ref=informal_zebra for a few of the not-quite-zebra crossings on private service roads. I will migrate all of the not:crossing_ref=zebra tags which I have added to this tagging style.
I keep seeing crossings like this one which are tagged as marked crossings. There are give way markings on the pedestrian/cycle way, but no markings on the road crossing itself. I’d consider that an unmarked crossing. What does the community think?
I can’t see any crossings on OSM at the location you gave, but there has been a problem with armchair mappers based in the USA mistaking give way markings for crossing markings. I’ve eradicated quite a lot of these in London following a Map with AI pedestrian mapping project.
If you have an uncontrolled pedestrian only crossing tagged as crossing=marked + crossing:markings=dashes, after survey/checking the imagery it should probably be changed to crossing=unmarked + crossing:markings=no and a separate highway=give_way node added to the side road.
I’ve made an initial stab at a wiki page for crossing_ref=pelican to describe it in a bit more detail. If/when people are happy with it, I’ll do something similar for puffin, toucan and pegasus crossings.
Are the dashes always give way markings in the UK? If so, maybe it’s worth creating a dedicated wiki page for crossing:markings=dots so there’s space to mention this point of confusion.
There are several types that can run across a road, most can broadly be lumped together as ‘wait here for someone with higher priority’. It gets a bit messy though as the marks parallel to the road/path don’t necessarily mean that and crossings have two ways intersecting.
As far as crossing go they’re meant to look like the illustrations in rule 19-28.
The ones at the ends of roads are there more for drivers than for pedestrians although the new “H” rules do emphasise that pedestrians should be considered when turning.
I don’t know all the ins and outs of the legal side of things.
(Can I just express my enduring envy that your country’s Highway Code has such a human-friendly official user guide that doesn’t require parsing legalese or engineering jargon?)
FYI: I’ve now moved the table of UK crossing types that I’d been putting together to the main OSM wiki at Crossings in the United Kingdom - OpenStreetMap Wiki . Do feel free to further improve that page by adding more tagging details, missing crossing types, and/or images.