Concrete vs concrete-plates?concrete:plates?
What exactly is the difference? Street complete gives me two options which look very similar,
* Concrete
Concrete `concrete`
* Concrete Plates
Plates `concrete:plates`
Further the definition isn't exactly clear on [the tag wiki](https://wiki.openstreetmap.org/wiki/Tag:surface%3Dconcrete:plates),
> Heavy-duty plates chained closely together, might have tar or sand in between the connections.
How do I know whether or not a plate is chained closely together? Does rebar in the form count? Do any two pieces of concrete with sand or tar in the crack count as a plate?
Moreover, the linking from `concrete` to `concrete:plates` says,
> For pre-fabricated plates, use surface=concrete:plates or surface=concrete:lanes if you know how the concrete is laid out and one of these tags fits.
Do concrete plates have to "pre-fabricated", which for me means fabricated off-site?
And specifically are roads that are poured one panel at a time, like this "plates"?
![alt text][1]
[1]: https://help.openstreetmap.org/upfiles/maxresdefault.jpg