I say unusual in the sense of Japan seems to be the only one to have solved the issue of how do you transport 2 kids on a bike not with "big box" like the dutch and subsequently the entire western world but via 2 seats, they're apparently very popular over there as a means of transportation.
all five of the two-child families have one!
lmao
tbf though there is single child seat mamacharis , it seems to me more a vibes bassed classification than an engineering one
deleted by creator
they do, I know i see them here. But it's not like, a cultural thing. That's just a bicycle with a child seat.