[Tagging] Feature Proposal - RFC - Advanced cycle barrier tagging

[Alex]

Hey Volker,

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".

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.

Alex


Am 12.07.21 um 15:28 schrieb Volker Schmidt:
> 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 <supaplex at riseup.net> wrote:
>
>> 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:
>> https://wiki.openstreetmap.org/wiki/Proposed_features/Advanced_cycle_barrier_tagging
>>
>> Please discuss this proposal on its Wiki Talk page.
>>
>> Alex
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>
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