What is the use of the key:roundtrip? Explanations just say roundtrip <https://wiki.openstreetmap.org/wiki/Key: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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