Feel sorry for you guys. Good money gone like that.
Just checking what's the speed margin you have to pass before they fine you? Can't keep the speed constant forever, sometimes will go below, sometimes will go above.
One of my friends told me +/-2km/h is the margin...I think that's really stingy. Not really familiar with the rules here yet, but back in my home country, the margin is about +/-10km/h.