[Tagging] Classification of roads in the CBD?

[Graeme Fitzpatrick]

Question that came up in regards to a Note in Australia:
https://lists.openstreetmap.org/pipermail/talk-au/2022-March/015968.html

Most of the streets forming the main traffic grid in the CBD of Brisbane,
Queensland are mapped as secondary, with others as tertiary:
https://www.openstreetmap.org/#map=16/-27.4704/153.0256.

The highway wiki is more about open road highways & doesn't discuss the use
of the various tags to show the importance of inner-city streets, although
I did see one comment that seems to agree:
https://wiki.openstreetmap.org/wiki/Talk:Tag:highway%3Dsecondary

Looking at other major cities, there's a wide variety obvious:
London: https://www.openstreetmap.org/node/107775#map=14/51.5081/-0.1222

Manhattan: https://www.openstreetmap.org/#map=13/40.7747/-74.0049

Berlin: https://www.openstreetmap.org/#map=14/52.5160/13.3917

Tokyo: https://www.openstreetmap.org/#map=15/35.6750/139.7555

As far as I can see, there's never been a discussion on CBD roads, so lets
have one!

How should they be mapped? By the amount of traffic they carry, or what?

Thanks

Graeme
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