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.

You have the right idea about the purposes of the classifications, it generally is meant to be close to how you've written. The info I gave on lanes is just a general guideline for how this has been applied.

As for the downtown streets, we tend to map what the ideal route is. Just because people can drive multiple routes, doesn't mean all those routes should be upgraded; only the ideal one. That way, routing engines will prefer it.

Also, to give a bit of explanation for downtown road classifications:
* William Street was classified as secondary because someone going from the southern part of Ann Arbor to Northside would likely take Main -> William -> Division.
* Streets like Ann Street or Washington Street are not classified as even tertiary because they really don't carry much through traffic. Almost everyone driving on Ann Street is going from or to somewhere along Ann Street.

No worries, I appreciate your interest in editing this area! Yes, you have the correct understanding of a spur. For example, you've upgraded Ellsworth Road to secondary, but that classification terminates at South Maple which is primary.

Same with Clark Road terminating at Hogback Road.

In general I would only upgrade a suburban road (outside of a dense urban core area) to secondary if it has multiple travel lanes in each direction (though not every road meeting those classifications is secondary). Roads that are still arterials but don't carry that level of traffic are better classified as tertiary.

The general classification guidelines on the wiki aren't super clear so I can totally get how this would be a bit confusing. Please let me know if you have any more questions!

Hi, can I ask that you please slow down with these edits? Some of the changes you've been doing have overclassified various roads, and also introduced numerous classification "spurs" which should be avoided.

This changeset has been reverted fully or in part by changeset 129965307 where the changeset comment is: Revert overclassification; this is being discussed at a different changeset.

Most of the discussion has taken place on Slack, so few have felt the need to edit that guideline page itself. The particular thread where that discussion was started is here: https://app.slack.com/client/T029HV94T/CCAEPLP33/thread/CCAEPLP33-1662863532.635799

The NFC is really not the correct source of classification to use here. It can be a useful tool but your interpretation is very much overclassifying these roads compared to how classification in OpenStreetMap is intended to be used. Please stop making these edits until you get a consensus to do so.

Can you please revert this? I disagree with a lot of these classification changes; this over-classifies many local arterials and needs more discussion. The guidelines there aren't really up-to-date and we're working on drafting better classification guidelines at osm.wiki/Michigan/highway_classification; I would encourage you to help with that as the project there has stalled a bit.