[Tagging] lanes = 0

Volker Schmidt voschix at gmail.com
Tue Jul 30 11:26:07 UTC 2019

Comments on the  Key:lanes <https://wiki.openstreetmap.org/wiki/Key:lanes>

1) Heading "Narrow roads"
The pageit proposes:

This construct is used 5k times acording to TI.
is used 40k times, and hence should be mentioned at least.

Furthermore the established tag
which has its own wiki page and is used 7k times, is missing in the text

2) "Assumptions" table:

The most frequent assumptions are missing, i.e. the case no lane count
and no indication of oneway/two-way.

Also, highway=path should not have an assumed lane count, as it is
normally not suitable for car-width vehicles

3) Examples

Bicycle lanes on cycleways

Under the heading "Description" the page says
"And the following lanes should be *excluded*:
Bicycle lanes. Use the tag cycleway
<https://wiki.openstreetmap.org/wiki/Tag:cycleway%3Dlane> for those."

but, under  "Examples" the page shows a bidirectional stand-alone
cycleway with a dashed separator with "lanes=2".,
a situation which I would have tagged highway=cycleway;
oneway:bicycle=no, but wihthout lanes=x tag

4) No line markings

Under the heading "No line markings"
the proposal, which is hidden there, i.e.lane_markings
opens a potential can of worms.
This tag is used 13 times in total. And there are zillions of roads
that have no markings in the real world.

On Tue, 30 Jul 2019 at 12:32, Jérôme Seigneuret <jerome.seigneuret at gmail.com>

> Please don't use lanes=0. That don't make sense! If there is a road marked
> or not there is one lane without oneway. lanes=0 is same as virtual road.
> Maritime road isn't marked and there is one lane in database (implicitly).
> This is a real word abstraction! Rules are etablished to work with this
> database. Oneway=reversible is an other way. This is a condition to pass
> because circulation work with conditional traffic_sign. If there is no
> condtional that can be lane=1 and if you twice to arrived in this point you
> shall apply civility rules.
> On area there is no represation of lane. all area is defaut one lane.
> there is no direction that is the problem to use it with routing parameters
> specificty for foot
> Le mer. 3 juil. 2019 à 00:31, Richard <ricoz.osm at gmail.com> a écrit :
>> On Thu, Jun 13, 2019 at 12:59:27PM +1000, Warin wrote:
>> > Hi,
>> >
>> >
>> > There are a few uses of lanes=0... I would think these are errors. Even
>> if
>> > unmarked a road would have at least one lane otherwise it is not really
>> a
>> > road.
>> >
>> >
>> > But looking at tag info there are a fair few uses fo it in various
>> > locations. So ... what is it used for?
>> this might also be something like an attempt at oneway=reversible
>> Richard
>> _______________________________________________
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> --
> Cordialement,
> Jérôme Seigneuret
> _______________________________________________
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