In fact, the tag should be "like-a-roundabout", right?
Le 8 novembre 2016 12:07:24 GMT+01:00, Daniel Hofmann <hofm...@mapbox.com> a
écrit :
>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
>>
>>
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