The Wiki is great for things like this. In this case the page on concrete has links to concrete slabs and concrete lanes, and both have pictures.
https://wiki.openstreetmap.org/wiki/Tag:surface%3Dconcrete
Hope this helps :)
this post was submitted on 15 Oct 2024
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I have to say it only adds to my confusion. What the heck is a “concrete plate”??
the example looks like the worst possible surface imaginable for a road.
I was also confused. I've been using concrete:plates for almost all walkways that I've encountered. On surface=concrete:plates it says this:
surface=concrete - concrete forming a large surface, typically cast in place and may have predetermined breaking joints
Which is confusing, because sidewalks AFAIK are cast in place and have predetermined breaking joints, but it seems like surface=concrete is more for mostly continuous concrete surfaces regardless of that text?
As I understand it, concrete plates, at least in the UK, tend to be quite big, like the road here:
You might find though that pavements / sidewalks are made up of smaller plates, as they're easier to transport and fit, rather than waiting for a large area of concrete to set. The only paths that I can think of right now that are concrete are on private property, so I can't link to them. They're things like garden paths and are continuous.
If you're not sure though, you can always tag as surface=concrete and let someone else add any extra detail in the future. At least then the basics are there :)