[Tagging] Streets as footways in Venice, Italy

[Martin Koppenhoefer]

Am Do., 28. Feb. 2019 um 14:38 Uhr schrieb Fernando Trebien <
fernando.trebien at gmail.com>:

> Even though it is not so comparable, in Brazil we have some places
> with really narrow public access paths that we decided to tag
> differently and we have so far liked the result (see [1] for an
> example). The criteria is simply if the way is wide enough for a car,
> if it's not then it gets downgraded to footway.



+1, I would at least require the width for a car (maybe even a truck, as
vehicles may be as wide as 2.5, in Italy)


> For instance, I quickly found this street which is 1.5 m wide, too
> narrow for a car: https://www.openstreetmap.org/way/24990562



the narrow ones may not even be recognizable on aerial imagery as ways.



>
> In some other cases, the measuring tool can also be used over imagery,
> such as to measure the widths of ways along channels, like this one,
> which is 1.8 m wide: https://www.openstreetmap.org/way/175023361
>
> Also, wide ways that are only accessible through narrow streets would
> also be downgraded to footway, like this one:
> https://www.openstreetmap.org/way/216498689



-1, I would not do this. I would mean to tag a 8 meter wide road as
footway, just because the paths to arrive there are narrow. Also, in
Venice, you will mostly have to cross bridges with steps, so width as the
only criterion would be inconsistent. I would rather use the width of the
way itself, regardless of the question that you can arrive there with a car
(or load a car off a boat, hypothetically of course).



>
> The wiki says that highway=pedestrian [2] is meant for streets in
> which some vehicle traffic may be authorized. I don't think this is
> the case of most places in Venice (all my searches turned up that no
> vehicles, not even bicycles, are authorized there).



"may be authorized" is not "must be authorized". It is not a requirement
for pedestrian, that come vehicles may go there. It is a possibility.



> The Italian
> translation of this article reflects this idea on the second
> paragraph. So I think that many highway=pedestrian in Venice are
> indeed incorrectly tagged and should be highway=footway.
>


+1



>
> I would propose that highway=pedestrian is used there to represent the
> safe, wide paths used during acqua alta and that others that may be
> submerged (even wide ones that may still be tagged as
> highway=pedestrian) receive tidal=yes, even if the adoption if this
> idea is low [3][4]. Acqua alta is indeed more common in a season, so
> seasonal=yes/winter is a possibility as well.
>


-1, acqua alta has nothing to do with width. You can often see Piazza San
Marco submerged. It is a question of elevation / position.
Nothing against tagging the susceptibility for high water, but let us not
intermingle it with highway classes.

Cheers,
Martin
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