question to enhanced tunnels and suggestion

I am sorry to interrupet again, but I am not sure with this:
I have seen in some help file or else images with used enhanced tunnels
(building over the entrances) and with special graphic on the entrance of  a
tunnel. i do not understand celar the note on documentation to that feature:
"graphical glitches that are not expected to be fixed until the new
graphical subsystem is implemented sometime after the next stable release."
I am not sure, which graphical issues?
Or did I only miss somewhere graphic to have nicer tunnels entrances?


And I have a question. Would it be possible to use enhancetunnels with roads
too? It would be nice for building metro (underground) railways under the
cities. I would spare another tile for the city and the tunnels would seem
nicer. I mean railway tunnel with city street over the entrance.

Mvek (Gaius I. Caesar)

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