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<p>Hey Volker,<br>
<br>
Thanks for your reference to Padova! The classification of the
types is primarily based on what impact the geometry has on the
users of the path/way – i.e., whether you just have to squeeze
through/slowly pass the barrier, or have to make one or even two
and more "turns". "Chicane" would therefore be insufficient for
evaluating passability, since there is a fundamental difference
between whether it is a single or double chicane. I have looked at
some barriers in Padova, but think that almost all of them can be
described with the proposed values. Or do you have an example
where the proposed attributes are not sufficent for describing the
situation/evaluating passability? One could, of course, include
more examples or describe "wild forms".<br>
<br>
The practical relevance of the tractrix curves would be to
calculate exact passability information from the width/overlap
data of the barriers for different vehicle profiles, without
having to use rough and inaccurate approximations. In the
proposal, there is a passability matrix for different dimensions
for two vehicle types – anyone familiar with tractrix curves may
calculate something like this for different barrier types and
vehicle profiles.<br>
<br>
Alex</p>
<p><br>
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<div class="moz-cite-prefix">Am 12.07.21 um 15:28 schrieb Volker
Schmidt:<br>
</div>
<blockquote type="cite"
cite="mid:CALQ-OR7uWQFYQ=d8+8kLLFJ0AzgWpDP=k6i91OUPgEwZDkQwhg@mail.gmail.com">
<pre class="moz-quote-pre" wrap="">Hi Alex,
a very interesting proposal. Pity that you worked on a local basis.
I am highly interested in this discussion, as I live and map in the
most-densely cycle-barriered city of the world (my guess): Berlin has
3 769 495 inhabitants and 537 barrier=cycle_barrier in OSM. Padova has
some 207 757 inhabitants and 309 barier=cycle_barrier. So we beat you 10:1
without penalty shooting.
We have more variety in barrier construction lo have some existing taggong
practices (undocumented in the wiki). In particular, in Padova we have 149
“barrier=cycle_barrier and "barrier:type"=chicane” (your double and triple
cycle_barriers). In total there are 429 of these in Italy.
If you want to get an idea of what is on the ground in Padova, follow the
cycle paths in Mapillary.
Do you have any reference to the practical use of the tractrix approach?
Volker
On Mon, 12 Jul 2021 at 13:55, Alex <a class="moz-txt-link-rfc2396E" href="mailto:supaplex@riseup.net"><supaplex@riseup.net></a> wrote:
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<pre class="moz-quote-pre" wrap="">Hey all,
I would like to invite you to discuss a proposal about "advanced cycle
barrier tagging": This proposal aims to extend the tagging for cycle
barriers in order to determine the passability of this kind of barriers for
different vehicle types, especially cargo bikes, bikes with trailers or
wheelchairs. It aims to solve issues that has been mentioned on the cycle
barrier wiki page for more than a decade.
You can find the Proposal here:
<a class="moz-txt-link-freetext" href="https://wiki.openstreetmap.org/wiki/Proposed_features/Advanced_cycle_barrier_tagging">https://wiki.openstreetmap.org/wiki/Proposed_features/Advanced_cycle_barrier_tagging</a>
Please discuss this proposal on its Wiki Talk page.
Alex
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</pre>
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<pre class="moz-quote-pre" wrap="">
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