[Tagging] Positioning motorway exits
colin.smale at xs4all.nl
Wed Mar 8 17:42:54 UTC 2017
Navigation systems, including commercial ones, mostly count down to the
LAST point - where the white triangle or lines make it illegal for you
to transition. This is in line with the wiki and current OSM practice.
Countdown signs on the approach to an exit however go to zero at the
FIRST point you can join the exit lane. People may expect, or prefer,
one or the other. Let's make sure we can accommodate both.
On 2017-03-08 18:33, Volker Schmidt wrote:
> At present we have many different approaches out in the field, which make life difficult to any routing software. I notice that we have another option, which I have not seen implemented in the database, i.e. to place the exit tag on the highway at the position of the last corresponding road sign before the actual split. This would require on-the ground knowledge or Mapillary/OpenStreetCam photos. It would also mean that the exit tag is not necessarily on the actual road split on the map. And it would require a lot of retrofitting work based on-the-ground checks. It would be in line with the wiki for "highway=motorway_junction", which states "This node should be positioned as the last point before the splay at which it is still possible to make a smooth turn."
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