[Tagging] Positioning motorway exits

Johan C osmned at gmail.com
Wed Mar 8 18:40:19 UTC 2017


I just took another look at several exits in Germany. As in the past I
found out that the OSM standard is to have the motorway_junction to the
link road before or at the legal point to transition. This is perfectly in
line with the motorway_junction page, which states: 'Add a highway
<https://wiki.openstreetmap.org/wiki/Key:highway>=*motorway_junction* tag
at each node [image: Node]
<https://wiki.openstreetmap.org/wiki/Elements#Node> along a highway with
named or numbered junctions where a driver can legally exit'.

So we already WIKIed a communis opinio

2017-03-08 18:42 GMT+01:00 Colin Smale <colin.smale at xs4all.nl>:

> 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.
>
> //colin
>
>
>
> 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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