On Thu, Oct 10, 2019 at 5:22 AM Warin <[email protected]> wrote: > On 10/10/19 20:46, Martin Koppenhoefer wrote: > > Am Do., 10. Okt. 2019 um 08:40 Uhr schrieb Frederik Ramm < > [email protected]>: > >> 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. >
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 Turn restrictions.
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