[Tagging] man_made=tunnel

[Tijmen Stam]

Idea: to make a man_made=tunnel, analogous to 
https://wiki.openstreetmap.org/wiki/Tag:man_made%3Dbridge; to group 
together multiple ways that go trough one tunnel; such as the 
about-to-open aquaduct at 
http://www.openstreetmap.org/query?lat=52.33003&lon=5.06909#map=18/52.32418/5.06413

The advantage would be that the ways could keep the name of the road and 
the outline can take the tunnel_name.

Is this possible? Would OSM render it?

Tijmen