Thank you Greg and CP for reminding me about the principles of ground
truth. I understand you are supposed to tag what is on the ground, do not
map against Mapnik styles, etc., etc.. I have stopped my practice about
moving traffic lights. I'm sorry I didn't provide that detail.
My original question was not about how to map traffic lights, but how
OsmAnd's routing algorithms handle this situation. I understand that
routers *should* treat a cluster of lights as a singularity. I am attemping
to learn if OsmAnd's particular implmentation of A* routing handles that or
not.
As a larger picture to better understand this, I plan on asking developers
from OSRM and GraphHopper as well.
I understand that OsmAnd is unique in that you can customize broad routing
decisions by modifying routing.xml:
https://osmand.net/build_it
But the file crudely hints that triple lights are not handled. It still
doesn't explain if and how double lights are weighted when, say, going
straight through a double carriaged intersection.
If this is not a group that the devs listen to, I apologize for taking up
everyone's time. I will keep looking elsewhere.
On Thursday, July 25, 2019 at 1:26:43 PM UTC-6, Curtis Brown wrote:
>
> Hi everyone,
>
> I want to ask about traffic lights in dual-carriaged intersections.
> Sometimes the intersections have traffic_lights on the intersecting nodes
> where the ways cross, and sometimes the lights are outside of the
> intersecting nodes. Here are two examples of intersections and the
> different ways traffic_lights are placed:
>
> lights on nodes:
> https://www.openstreetmap.org/#map=19/35.13084/-106.58631
> lights off nodes:
> https://www.openstreetmap.org/#map=19/31.76873/-106.31877
>
> I have been moving traffic lights out out of these intersections, largely
> for the reason brought up here:
>
> https://groups.google.com/forum/#!topic/osmand/jHjZ_zGF_Vg
>
> I would see that if a user needs to make a left turn, through an
> intersection with lights on intersecting nodes, the router would penalize
> the path heavily for having to route through three traffic lights in a row.
> I have been told that if the intersection has lights in the intersecting
> nodes, that is sufficient for mapping and should not change. The OSM Wiki
> page seems to state that "there is no well established convention on how
> this problem should be ideally solved".
>
>
> https://wiki.openstreetmap.org/wiki/Tag:highway%3Dtraffic_signals#Tag_all_incoming_ways
>
> I am genuinely curious to know from OsmAnd developers what their point of
> view is. Does OsmAnd's routing prefer traffic_lights moved out of
> intersecting nodes of dual-carriaged intersections, or does its routing
> treat a cluster of traffic_light'd nodes as a single weight?
>
>
> Thank you in advance for helping me understand. -curtis
>
>
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