[Tagging] Divided highways, and not so divided highways, one way or two
baloo at ursamundi.org
Fri Oct 11 00:01:55 UTC 2019
On Thu, Oct 10, 2019 at 5:22 AM 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)
> Will need further though, but the above provides for either side of the
> road driving.
Something that I wish routing engines would be better about: Whether or
not to allow U-turns. Because I seriously doubt all 3,700+ intersections
in Oregon that don't allow U-turns (literally every traffic light that
doesn't have a "U Turns OK" sign per Oregon state law), and I know not all
of the 831 signalized intersections in Tulsa (no U turn allowed at traffic
signals, it's never posted otherwise, per city code) are tagged with No U
-------------- next part --------------
An HTML attachment was scrubbed...
More information about the Tagging