This rule only applies in the countryside.
Never in town, in elevators, hotels, coffee shops, etc.
Norwegians need to have the opportunity to escape to greet a stranger.
They will think you are weird if you greet them without a reason when they are not in nature.
This is one of the 100 Unwritten Norwegian Social Laws presented in our new book "The 100 Unwritten Norwegian Social Laws"
Read more about our amazing Norwegian friends in our other Social Guidebooks to Norway written by Julien S. Bourrelle