Right, from https://supaplexosm.github.io/strassenraumkarte-neukoelln/po... (translation https://translate.google.com/translate?sl=auto&tl=en&u=https...), there was an extra curb data-set used. I've actually found a few of these (https://a-b-street.github.io/docs/tech/map/geometry/index.ht...), so the approach is maybe repeatable.

Regardless, the design choices and color scheme are something I would love to adapt.