Maybe theyre short of footage for police stop!?
they have most of the motorway covered now, theres cameras every major intersection too. like tararoto (sp?) and northcross, wairau and tristam.
They wanted to put chips in peoples cars for raod user charges. the chips could be read from satellite... why a petrol tax wouldnt be simpler easier and reward people for economical cars i dont know. except if they wanted to be able to a) tell where you are at all times b) tell if your speeding.
i hope something like this never happens the "if your not doing anything wrong you dont need to worry about it" argument doesnt agree with me.