I am playing Euro Truck Simulator 2 and driving around doing the Quick Jobs because I've only just started and don't have enough money to purchase my own truck. As it is a simulator there are speed limits on all of the roads and speed cameras placed. Many times I have been in a road marked as national speed limit zone indicated by a white circle with a black line through it but I've been given a speeding ticket for doing 55mph
edit: as an additional example, I just got a speeding ticket on the motorway for doing 55mph as well!
What am I doing wrong?