Is this really a motorway? It doesn't appear to be a public road, nor one that qualifies as a limited-access highway.

Yeah, motorway is usually reserved for a controlled-access road with at least two lanes in each direction (so vehicles can easily pass).

This changeset has been reverted fully or in part by changeset 141087813.

This changeset has been reverted fully or in part by changeset 141087813.

This changeset has been reverted fully or in part by changeset 141087813.

Hello, what is the reasoning for this edit? "Super two" roads, like the CTP is here, are usually tagged as trunks.

Hi, this is a misuse of the speed limit tag (considered tagging for the renderer). Can I suggest using other tags instead such as smoothness=horrible (assuming the reason this route is dangerous is because the road is in bad shape)?

Why did you tag these as motorways? They definitely are not (I am reverting the classification).

Nice job mapping this so quickly!

Thanks :)

This changeset has been reverted fully or in part by changeset 135365665 where the changeset comment is: Revert nonsensical edit.

The best place to discuss this sort of thing is probably OSM's Slack.

Michigan chat: https://app.slack.com/client/T029HV94T/CCAEPLP33
Highway classification chat: https://app.slack.com/client/T029HV94T/C02ERCAMFU1

And uh... I think it's because OSM started in England? There was a 2021 project to improve and standardize road classification guidelines in the US: osm.wiki/United_States/2021_Highway_Classification_Guidance

This is only a general guidance though, and doesn't give detailed info on urban classification. I've created a page for coordinating Michigan highway classification, but currently we've only really standardized rural trunk roads: osm.wiki/Michigan/highway_classification and have only started to address urban trunk roads and not at all on rural or urban primary roads. Secondary and lower probably don't need to be centrally listed given how common they are around the state.

This is also why I would not upgrade the part of Maple Road that is South of Ann Arbor to secondary. Ann Arbor-Saline Road is secondary because it connects Ann Arbor and Saline, and Maple Road makes that same connection, so only one of them should be secondary. Ann Arbor-Saline Road is the better route to take in most cases, so it gets classified as secondary.