Cyclist in Japan have had dedicated bike lanes or marked paths on the road for many years but still use the sidewalk even if it causes problems for pedestrians.

I'm speaking a bit out of my field here because I'm not Japanese, but I had the impression that historically, many Japanese cities are much more amenable to share the sidewalk with cyclists (compared to EU/NA), and several of these bike lanes start and end abruptly as part of the sidewalk instead of the road anyway, right? Same goes for pedestrian sharing space with cars and bikes in their narrow streets, sidewalks are almost non-existent because they're culturally acclimatized to just walking in the street and hop on the sidewalk only if a vehicle needs to pass by.

And by looking at the ridiculously unsafe bike "lanes" they have (almost all are totally unprotected), I'd definitely be on the sidewalk if I lived there too. If you want Japan to enforce bike lanes, you gotta ask Japan to build better bike lanes first 🤷‍♂️