[OSM-talk] park barrier

Martin Koppenhoefer dieterdreist at gmail.com
Tue Aug 11 18:50:53 BST 2009


2009/8/11 Tobias Knerr <osm at tobias-knerr.de>:
> Martin Koppenhoefer wrote:
>>> This can be applied to any way as long as that way needs to be used when
>>> passing the stile. The stile should be a node on that way, but whether
>>> it is the first/last node or any node inbetween doesn't matter at all.
>>
>> I see this differently as the restriction does not apply to the whole
>> footway but just to the part crossing the style. If the footway is
>> some kilometres in length, why would you want to map it as oneway for
>> all this part?
>
> I wouldn't, I originally thought about adding something along the lines
> of "of course, that way shouldn't be kilometres long", but thought it
> was obvious anyway...
>
> In most situations reality will provide a way section with a length of a
> few meters whose only purpose is to go through the stile, so there will
> be a "natural" way to use for this. Otherwise, people will probably be
> intelligent enough to just split it.
>
>> IMHO you have to split the way after ~50cm after the
>> stile (width of the stile) and not to start before your inside the
>> stile (otherwise you will get "trapped" inside a normal footway (for
>> routers) not beeing able to return if e.g. the stile is closed.
>
> I don't think that this "trapping" situation is relevant in realistic
> cases (i.e. a few metres of way tagged like that) - it will even be
> below GPS accuracy.

when talking about how to tag a feature I wouldn't make too many
assumptions on GPS-accuracy and other practical issues. This is about
how to represent the situation in an adequate manner. Why not use the
best solution, if you are all free (there is no in-use tags for this
until now)? Actually I don't want a tag that works "in most
situations", but one that works best at least in "all currently
imaginable situations".

Therefore I would explicitly recommend that the way starts at the
turn-stile following the direction of passing through it, as you will
never turn back once passed, while you might always turn back before
you pass it.

cheers,
Martin




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