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

Andrew Harvey andrew.harvey4 at gmail.com
Thu Oct 10 10:39:22 UTC 2019


On Thu, 10 Oct 2019 at 21:23, Warin <61sundowner at gmail.com> wrote:

> On 10/10/19 20:46, Martin Koppenhoefer wrote:
>
> Am Do., 10. Okt. 2019 um 08:40 Uhr schrieb Frederik Ramm <
> frederik at 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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