On Thu, 10 Oct 2019 at 15:50, Vɑdɪm <vadp.d...@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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