In the second example "Skalitzer Straße" has right of way. Here are the instructions emitted at the moment: http://www.openstreetmap.org/directions?engine=osrm_car&route=52.49915%2C13.41952%3B52.49857%2C13.41852#map=19/52.49896/13.41865
it's a total of four turn instructions every 10-20 meter since there is no proper tag for the routing engine to differentiate this from a road with four intersections. Instead the routing engine could emit a single instruction here. My argument is this: there already is a pseudo tag for these Not-a-Roundabouts: it's 1/ no junction=roundabout tag and 2/ a note tag containing "roundabout" / "Kreisverkehr" Here's an example: http://overpass-turbo.eu/s/jTV querying for (junction!=roundabout) and (note~"roundabout|Kreisverkehr") The routing engine could do the same parsing note tags. This would allow us to classify probably all popular ones at least. But it's a hack and that's exactly my point: there should be a proper tagging scheme to tag this. On Mon, Nov 7, 2016 at 5:09 PM, Dave F <davefoxfa...@btinternet.com> wrote: > Hi Daniel > > Second example: Which junction has priority? From a quick look on > Streetview all junctions appear to be light controlled. > > Could you expand on what 'special instructions' the routing engine is not > able to issue? > > DaveF > > > On 07/11/2016 14:30, Daniel Hofmann wrote: > > Over at OSRM we're not only doing Routing on OSM but also Guidance for > users once a suitable route is found. In order to make the user experience > great and the instructions pleasant to use we differentiate between > > 1/ Roundabouts > Think: "at the roundabout take the nth exit" > > 2/ Roundabout Intersections > These are roundabouts with up to four ways and turn angles which makes the > turns obvious. > Think: "at the roundabout turn left" > > 3/ Rotaries > These are large and named roundabouts. > Think: "at Meinplatz take the nth exit" > > 4/ Not-a-Roundabout (what this post is about) > There are situations where one of the entering road has right of way, > which disqualifies the scenario for being classified as a roundabout. The > Wiki has a section on these Not-a-Roundabouts: > > http://wiki.openstreetmap.org/wiki/Tag:junction% > 3Droundabout#Not_a_roundabout > > In all these cases, the key “junction” is not necessary at all. You need > no special tagging. > > Most of these Not-a-Roundabouts have a note on them, telling users not to > tag them as junction=roundabout as this is a common mistake. Here are two > examples in Berlin: > > Bersarinplatz > > http://www.openstreetmap.org/way/288767318#map=19/52.51849/ > 13.45355&layers=D > > http://www.openstreetmap.org/directions?engine=osrm_car&; > route=52.51786%2C13.45348%3B52.51918%2C13.45281#map=19/52.51852/13.45327 > > Kottbusser Tor > > http://www.openstreetmap.org/way/159155852#map=19/52.49898/ > 13.41881&layers=D > > http://www.openstreetmap.org/directions?engine=osrm_car&; > route=52.49915%2C13.41952%3B52.49857%2C13.41852#map=19/52.49896/13.41865 > > As you can tell, for both of those situations the routing engine is not > able to issue special instructions since there is no tag to parse. And > parsing note tags for the occurrence of roundabout is not a solution ;) > > With the current situations of having note="don't tag as roundabout" > pseudo-tags on most of those it would make sense to establish a proper > junction=not_a_roundabout tag (tag is up for discussion) software can parse > and make use of. > > What's your opinion on Not-a-Roundabout? > > Cheers, > Daniel J H > > > _______________________________________________ > Tagging mailing > listTagging@openstreetmap.orghttps://lists.openstreetmap.org/listinfo/tagging > > > > _______________________________________________ > Tagging mailing list > Tagging@openstreetmap.org > https://lists.openstreetmap.org/listinfo/tagging > >
_______________________________________________ Tagging mailing list Tagging@openstreetmap.org https://lists.openstreetmap.org/listinfo/tagging
