You havn't done much driving in Norway, have you?
1500 km in Norway equals 30 hours in the car I would say! And with their prices on speeding tickets you don't want to try to go faster, belive me!
I have a friend who got a ticket for 50 000 NOK (that's 5 500 EUR or $6 200) when he was on biking vacation in Norway. He wasn't all innocent as he was doing 130km/h on a 70km/h road, but it's just a five seconds twist of the wrist, so be careful !