I interpret roundtrip as “you can get from a stop to another stop that’s *before* it in the list of stops by simply remaining in the vehicle”.
You can have routes where the start and stop are the same location, but this is not true (as the vehicle always goes on to serve another route after arriving at the last stop). From: Peter Elderson <pelder...@gmail.com> Sent: Friday, 25 May 2018 15:48 To: Tagging list OSM <tagging@openstreetmap.org> Subject: [Tagging] roundtrip What is the use of the key:roundtrip? Explanations just say <https://wiki.openstreetmap.org/wiki/Key:roundtrip> roundtrip=yes/no (optional) Use roundtrip=no to indicate that a route goes from A to B. Use roundtrip=yes to indicate that the start and finish of the route are at the same location (circular route). It seems rather pointless to tag an obvious a-b route with roundtrip=no, or an abvious roundtrip with roundtrip=yes. Why would you tag an a-b route as roundtrip=yes, or a closed route as roundtrip=no? The only use case I can imagine is when a roundtrip has one ore more access ways which are included in the route relation. But even then, what is the purpose? Allowing apps to select only "official" roundtrips? Is that a valid reason for tagging? -- Peter Elderson
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