@mszll@datasci.social One thing that may have a bad influence on your studies are small gaps. Traditionally some small gaps were fulfill for the sake of making possible to routing apps to work. Nowadays, I read it is advice to link them but use highway=footway + footway=link (if it were a pedestrian path) or analogous for the bicycle. So that small gaps can be detected (and not neglected) and at the same time routing can work even if there were 4 m of pedestrian/road part