bxl-forever left a comment (openstreetmap/openstreetmap-website#6425)
The placement of arrows can be tricky if the same way is used several times in
the same relation. Whereas most bus routes have a logical structure, we also
have a fairly large number of cases where a bus route does a loop and uses the
same ways several times during the same trip, either once in each direction or
twice in the same direction. If we must test all the conditions, it might
imply a performance hit to render the relation.
Example here: https://www.openstreetmap.org/relation/15681845 (Yes, this is a
valid PTv2 relation and this is a single trip.)
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