I done a Haz chem licence with ISM a few weeks ago and the trainer was saying that Weight recognition tech is embedded in the 50 and M1 already and they can check that trucks are not overloaded .The cables are embedded in the road deck .They also use average speed cameras in most of the tunnels .Time you in time you out, get an average speed .ISM fella says he is not sure if the legislation to use the information is yet passed or if they are only trialing the system at the moment .