[Tagging] roundtrip

[Peter Elderson]

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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