Hello, thank you for your comment. You're right, probably I'm not aware enough of Danish street signs, on the road there was actually only a bike sign so that I thought it's officially only for bikes (despite you can walk there).
The other reason I have marked this particular stretch of road as non-pedestrian is because there is no safe way to cross the road. It is a motorway and the street lights are only installed for car traffic, there is no tragic light for pedestrians to cross. You literally have to run, if you want to cross the lanes when the road is clear to continue towards Roskilde. That's why I've mapped this part as non-pedestrian, so that navigation systems will tell pedestrians to use the other side of the road if, for example, they're coming from the north and want to continue to Roskilde.