[Tagging] new role for route relations: reverse

[Paul Allen]

On Mon, May 28, 2018 at 3:40 PM, Erkin Alp Güney <erkinalp9035 at gmail.com>
wrote:

> Does it have any stops in the street it reverses into?


Not that I've seen.  But if somebody asked to get off there I'm fairly sure
that most of the
drivers would permit it.  And since it backs as far as a bench, I'm also
fairly sure most
drivers would let somebody sat on the bench waiting for the bus to board
there.


> If not, it is not formally a part of the route and just a convention.
>

Yes, but without it the route involves a role called "magic_turntable."

If this were an end of route turnaround at a terminus then it's not
mappable.  What
happens when passengers are not on board and the bus is technically out of
service
are not part of the route.  But this is done with passengers on board in
the middle of
the route.

Sure, renderers and routers might cope with the bus going to point X and
magically
switching its direction of travel by 180 degrees but it's a bit puzzling
for data
consumers.  Does the bus go out of service there?  Is it a terminus?  Has
the mapper
made a big mistake in the route?  Did some other mapper come along and
accidentally delete part of the route?  Etc.

Unless having role=reverse is going to cause big problems for renderers or
routers I don't see any problem with having it.  I doubt it's going to get
used
often, so it's not a problem regarding data storage.  But I could be wrong.

-- 
Paul
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