`highway=bus_guideway` vs `highway=busway`

In OSM the tags highway=bus_guideway and highway=busway are in somewhat regular use.

In the UK we have lots of the latter, but it appears that we also have some accidentally mistagged as the former.

There are genuine guided busways of course (the Cambridge / Ely one is probably the most famous) but some of the others I am suspicious about - like the one in Leeds.

Does anyone know if any of these are definitely mistagged?

I’ve seen this kind of thing before, and most of the time, it seems to be motivated by the lack of rendering support for highway=busway in Carto.

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There are or were two guideways in Leeds(also one in Bradford) : Scott Hall Road and York Road. There has been a proposal to get rid of one of them.

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There are also a handful of what should be highway=busway, tagged as highway=service + access=no + bus=designated for the same reason as above, to make them display on carto. For example Luton-Dunstable busway which has become an edit war at this point Changeset: 177190730 | OpenStreetMap (this one does allow cycling which complicates things).

There’s a bus-only road in Bristol which I’ve tagged as part bus guideway, part busway, which of course looks silly on carto, but is correct. Way: 517659892 | OpenStreetMap

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I thought the Luton one was guided.

It’s mostly guided, but some sections are unguided for example around Luton station. The example changeset I shared changed highway=busway to higway=unclassified because “highway type ‘busway’ becomes invisible on map and does not allow bus access. This affects public bus map data that is based on OSM.” I think there are also some OSM-based games that don’t support certain busway tags (City Bus Manager?), but don’t quote me on that.