That's the exception...  mostly voetgangers gebieden.
pedestrian area.
But up to you.
The routing lines are cosmetic. Yhey look invisible because of the area=yes
It's a way of mapping for good routing.
Here the samen trick for routing in pedestrian are.
cycling is also permitted some hours.
https://www.openstreetmap.org/#map=19/51.813959/4.669026