Just because the punishment is legal doesn't mean it isn't excessively harsh. Would you have the same reply for someone who was caught with a bag of weed in Singapore and was facing caning and a long prison sentence?
Norway comes down strongly on speeders ( http://www.speedingeurope.com/norway/ ) with mandatory jail time, etc. Seems like it is just part of how Norway regulates drivers.
That's not much of a moral argument, which from context is the type of argument the poster was making.