[openstreetmap/openstreetmap-website] [Feature] Add a way to overlay speed limits. (Issue #3500)

[Tobias]

> I believe there should be an option to overlay speedlimits with colors corresponding to each speed on roads. If no speedlimit data has been entered, don't display an overlay.

In case you are just using this for your mapping or some smaller community, you could use something like this https://twitter.com/tordans/status/1482325001474875396. While working on this, I realized how bad the `maxspeed` data is (even) in Berlin. I think a big part of this is, that is is nearly invisible so no one notices.

> What would the purpose of this be? Specifically who do you seeing using this, and what for?

I was looking into this recently. My UseCase is: We have a few datasets in OSM that is quite invisible but very important. `maxspeed` is one example, `surface`/`smoothness` is one. The `parking:lane` tags are another. One could create a full map style for this…; but I see this more as a utility layer on top of a (grayed out?) (pixel?) basemap.

Right now, we are looking for a way to scale the (quite manual) data parking lane data from https://supaplexosm.github.io/strassenraumkarte-neukoelln/?map=parkingmap#18/52.48048/13.42856 to all of Berlin by moving the logic into lua scripts in https://github.com/gislars/strassenraum-berlin.

It would be great, if the OSM ecosystem could provide a way for such projects to create their own specific vector tile datasets. And once those are mature, they could be shown on osm.org.

It looks like https://github.com/openstreetmap/operations/issues/565 is more focussed on creating a basemap style (and the vector data needed for that). However, this would require special data processing like the parking data example shows.

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