[Tagging] Divided highways, and not so divided highways, one way or two

Alan Mackie aamackie at gmail.com
Fri Oct 11 07:17:24 UTC 2019


On Thu, 10 Oct 2019 at 15:50, Vɑdɪm <vadp.devl at gmail.com> wrote:

> Florian Lohoff-2 wrote
> > On Thu, Oct 10, 2019 at 08:38:28AM +0200, Frederik Ramm wrote:
> > Mapping large, multi-lane roads with a "do not cross line" in the
> > middle as single line requires 4-5 times the number of turn
> > restrictions. These are number i am estimating from my own experience
> > mapping it one or the other way.
> > At every way junction one has to model every disallowed way/turn.
> > From my experience this is very error prone.
>
> +1
>
> Also there are some arrangements which probably do not have a simple
> solution even with centre=* tag suggested here.
>
> For example a street with a tramway track in the middle separated from the
> rest of the roadbed by dividing lines at each side which vehicles cannot
> cross: https://goo.gl/maps/VHKbwjMoCVwawHxU9. By the way tramway tracks
> are
> drawn with two separate ways, so a single way line in the middle would make
> you think that the tramway tracks are not in the middle of the roadbed but
> at its sides.
>
> Another example is a bus lane in the middle of the road: 2 lanes of forward
> traffic, a forward bus lane, a backward bus lane, backward traffic
> https://goo.gl/maps/FubkLdHRP6DHLkv86.
>
> Yes another one is a bus lane on the right side, but it turns on the left
> through 4 lanes of normal forward traffic which not allowed to turn left
> https://goo.gl/maps/QFcfDW9h7cQ3UMJaA.
>
> I think for some of the more complex streets some grouping concept is
needed whether via areas or relations. The latter is probably a bit
fragile, the former is at least somewhat consistent with man_made=bridge
and previous 'junction area' proposals.

There was a talk along these lines at SOTM recently, although I'm not so
keen on the areas overlapping:
https://media.ccc.de/v/sotm2019-1038-is-the-osm-data-model-creaking-#t=1263

For the primary way mapping I don't think we should be splitting ways
according to direction unless there is a barrier or median.
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