[Tagging] Positioning motorway exits

Volker Schmidt voschix at gmail.com
Tue Mar 7 09:44:26 UTC 2017

This touches on a "conflict of interest" between two requirements:
(1) OSM tagging practice is to map only physically separated ways as
separate ways in OSM.
(2) A routing algorithm needs to have information about legally separated
ways, e.g. by a continuous white line.

In the specific case the exit for the routing algorithm is at the beginning
of the continuous white line, i.e node
whereas the split of the ways according to the rule of the separate ways
puts it at node https://www.openstreetmap.org/node/370544/, where the
motorway junction is placed at the moment.

To my knowledge there is no agreed upon common practice.

I do not map motorways in Germany, but have mapped motorways and trunk
roads in Italy where we have no established common approach, and you can
find a nice mix of different approaches. I think we should come to a
general best-practice or best-practices agreement. This may imply
country-dependent recommendations.
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