Winter tires are actually a must in the winter in Norway.
The use of winter tires is not compulsory for vehicle combinations under 3.500kg. However, drivers do have a duty to ensure sure their car in winter conditions is fitted with tires that has enough grip on the road.
It is advisable therefore to use winter tires in Norway during the winter season. The minimum tread lighter than 3.500kg 3 mm for winter tires on vehicles.
The use of winter tires is mandatory for combinations over 3.500kg. The requirement applies from November 15th to March 31st. Winter tires must be fitted in the case of an M + S logo and the minimum tread depth is 5 mm.