[Tagging] transport=* -key

[Thilo Haug OSM]

Hi all,

what is the meaning of the transport=* -key ? 

I couldn't figure it out because it's often on buildings (possibly
"reachability" ?)
There's a total of 4 013 usages, but no wiki description :
https://taginfo.openstreetmap.org/keys/transport
<https://taginfo.openstreetmap.org/keys/transport>

There are 833 entries of transport=subway,
this would fit into the "public transport" tagging ?
https://wiki.openstreetmap.org/wiki/WikiProject_Cleanup/Public_transport

Are there any other similar wiki entries ?

Cheers,
Thilo

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