Unwritten Norwegian Social Law § 48
"You shall not walk in cross-country ski tracks without wearing skis"

If you do, Norwegians may scream "Løype" or stare at you.
“Løype” means “slope”, but really it means “Get the hell out of the ski slopes”.
While there are not many politeness norm and rituals in Norway,
politeness is usually about not disturbing others.
In Norway, ski tracks are maintained better than the national highways, and Norwegians are very proud of that.
Enjoy the Norwegian winter :)
Read more about Norwegians and the Norwegian culture in our "Norwegian Toolkit"