I like the line "with little or no inconvenience to the vehicle operator" when this whole procedure violates my right to face my accuser. And, there's the proving yourself innocent problem, just like those speed and red-light cameras. Fortunately, so far, the ones I've seen are easily avoided, which I do. I'll turn around and drive around the block rather than drive through this measuring station. At least the emission test is free if you pass, though where is the compensation for my time that I have to take off from work or sit in line for hours to get the test.
Consider that the sign posted next to the van merely says, "Survey ahead". That is quite misleading. I thought they were surveying traffic patterns by seeing which cars take the same routes every day. They really snuck this one up on us.
Rant rant rant rant...
Asterix