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Same problem in Belfast, some kerbs are cycling/peds then are a normal kerb and then nobody knows what's what.
It's usually not such a problem few people get annoyed by it. Even when you are on a pedestrian only kerb. Lol though at the kerb cycling helmet hi-vis lot ;)
http://bikefast.org/2016/03/14/lazy-danger-shared-footways/
Edit it also leads to conflicts unless there's lots of room..
Sometimes you just can't win...