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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