[Tagging] Correct tagging of foot and cycle crossings on tables

[Volker Schmidt]

Here in Italy we have pedestrian, cycling, and foot/cycling crossings on
elevated tables, usually combined with speed limits for the road traffic
valid for the point of the crossing. (the fact that the hump sign is above
the speed limit sign, indicates that the speed limit is applicable only to
the to the hump)
I am trying to find a correct tagging that reflects as close as possible
the reality and that also is correctly "digested" by foot, cycling, and
motorcar routers.

Here <https://www.openstreetmap.org/node/246144396> is an example of a foot
and cycling crossing of that type.
This is the crossing cyclist's perspective
<https://www.mapillary.com/map/im/cRxWabVQa6D5vcykWB6Rsw>
This is the cyclist's perspective on the crossed road from the SE
<https://www.mapillary.com/map/im/i1B542cZSHzlk3jknMlE8A>
and from the NW <https://www.mapillary.com/map/im/R8CRn5zCnjIWZwuqqJbdnw>

Several doubts/questions:
I tagged both the speed limit and the table on the crossing node that is
shared by the crossing way and the road way.
On the road the speed limit is announced for the hump or table ahead, i.e.
the speed limit is limited to the actual crossing point (a node in OSM).
The hump/table is only present for traffic along the road, the crossing
foot-bicycle traffic has no hump or table.

Is the speed limit on a point meaningful?
What about the false table and the false speed limit on the crossing way?

Any suggestions for improvements, avoiding, if possible, any nano-mapping,
because we have many of these (431 only in my city)
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