[Tagging] Positioning motorway exits

Jo winfixit at gmail.com
Tue Mar 7 14:45:51 UTC 2017

Extra credit if we can come up with a 'universal' solution :-)


2017-03-07 10:44 GMT+01:00 Volker Schmidt <voschix at gmail.com>:

> 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
> https://www.openstreetmap.org/node/4337339247
> 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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