On Thu, 10 Oct 2019 at 21:23, Warin <61sundow...@gmail.com> wrote:
> On 10/10/19 20:46, Martin Koppenhoefer wrote: > > Am Do., 10. Okt. 2019 um 08:40 Uhr schrieb Frederik Ramm < > frede...@remote.org>: > >> The original mapper claims that using two separate oneway=yes ways is >> clearer and easier, as it does away with the need for turn restrictions >> at junctions. > > > > > this is an interesting aspect: why do we need turn restrictions, wouldn't > it be sufficient to tell the routing engine that there is a line that > cannot be crossed (and add a tag for interruptions to this on the junction > nodes where you can cross), and we could save a lot of turn restriction > relations which would be already implied? > > I recall this was suggested many years ago, but for some reason it did not > fly. Maybe it is because it was too complicated to find out under which > circumstances (in which jurisdictions) white lines had which meaning? Maybe > we should not map the lines physically, but according to their legal > meaning, something like (shorter tags would be chosen): divider that cannot > be crossed (legally), divider that can be crossed legally, divider that can > be crossed but only for turning left not for u-turns, etc. > > > Allowing for different diving on different sides of the road? > > Centre cannot be crossed (all) > > Centre cannot be crossed for U turns (turn offs allowed) > > Centre cannot be crossed for turns (U turns allowed) > > Centre cannot be crossed for turn offs (U turns, turn ons allowed) > > Centre cannot be crossed for turn ons (U turns , turn offs allowed) > > > > centre > =no_crossing/no_u_crossing/no_turn_crossing/no_off_crossing/no_on_crossing/yes_crossing/??? > > Will need further though, but the above provides for either side of the > road driving. > That sounds very similar to https://wiki.openstreetmap.org/wiki/Key:overtaking which let's you determine when you can cross that dividing line when tagged as a single undivided way.
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