In Illinois, they can put your car on a rolling dyno for 240 seconds to similate road conditions. I used to hate taking my manual trans cars there!
They had that system here in Missouri too, but cancelled the program last year. Well, they did away with it being state operated, now individual shops can inspect and do the emissions test. No tail pipe tests, they just hook up the on board computer to see if it passes. My VW failed the first time because the computer read it as a bad glow plug (its a diesel). So we re-set the computer and it passed... I don't understand the point of it, except legal extortion money for the state.
On the outside, I may appear like an emotionless, sarcastic jerk.
But just like an onion, when you peel off more layers,
you find the exact same thing every single time and you start crying.