[Tagging] Proper Tag for Not-a-Roundabout
hofmann at mapbox.com
Tue Nov 8 11:07:24 UTC 2016
In the second example "Skalitzer Straße" has right of way.
Here are the instructions emitted at the moment:
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
Instead the routing engine could emit a single instruction here.
My argument is this: there already is a pseudo tag for these
it's 1/ no junction=roundabout tag and 2/ a note tag containing
"roundabout" / "Kreisverkehr"
Here's an example:
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 <davefoxfac63 at 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?
> 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:
> > 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:
> Kottbusser Tor
> 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?
> Daniel J H
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