There are a number of traffic laws that are not always posted and vary for each administrative area. U-turns in Oregon, prima-facia speed limits in most of the US, etc. I think there should be a way of tagging the bounding polygon or boundary relation with that information to see the defaults a router should use. Nested administrative areas should work just fine too (city overrides county, county overrides state, etc.) if the road is contained within more than one administrative boundary.
I suggested this on speed limits a while back and it did not seem to be well received. But it sure would handle a lot of traffic routing and speed limit cases in the United States pretty well. -Tod > On Aug 18, 2015, at 9:45 AM, Paul Johnson <[email protected]> wrote: > > > On Tue, Aug 18, 2015 at 11:23 AM, Martijn van Exel <[email protected] > <mailto:[email protected]>> wrote: > A colleague pointed out that there are areas (towns) where U turn > restrictions are in place that govern all streets in that area. I wonder: > > 1) Does anyone know if this is common? I don't have any anecdotal experience. > > Oregon. All of it. Unless otherwise posted, U-turns are prohibited in the > following conditions: > > a) Any intersection with an electrical signal (this includes single-aspect, > always-flashing signals; HAWKs <https://en.wikipedia.org/wiki/HAWK_beacon> > and half-signalized intersections (the cross street faces a stop sign and a > pedestrian signal, the through street faces a traffic light; only pedestrians > can trigger the traffic light)), anywhere in the state. > b) Any point between intersections when inside city limits. > c) Anytime oncoming traffic can't see you make such a turn in advance at > least 500 feet ahead in the city or 1000 feet outside city limits. > > Fine is $120 (and a mark on whatever strikeout system they have now for > motorists if you're not on a bicycle, skateboard or other human powered > locomotion when you do it; yes, making such a turn on a motorized wheelchair > would count as a motor vehicle for this enforcement!). Yes, this means the > number of places you can legally make a U-turn anywhere in the state is > countable on your digits if you take your shoes off. Then ODOT just gets > plain asshole with this in Beaverton, where there's signage on OR 8 at the > first few signals leading west from OR 217 where there's a U TURN PERMITTED > sign with a CARS ONLY supplemental placard, in which any reasonable person > would assume they mean "NO TRUCKS" or other long vehicles with a wide turning > radius, but Beaverton Police routinely pop bicycles and motorcycles for the > move... > > 2) Is there a known tagging scheme for this? Area based traffic resctrictions? > > No, but it would be handy, because there's literally no way anybody's tagging > this for every approach of every intersection with a traffic light, HAWK or > half-signal in Oregon that doesn't have an explicit exception. > _______________________________________________ > Talk-us mailing list > [email protected] > https://lists.openstreetmap.org/listinfo/talk-us
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