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Originally Posted by PaulC
Perhaps just the presence of visible exhaust. Should be a real moneymaker, especially in cold weather.
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That's why I'm thinking it must be more than just a cloud. If it has a temp associated with it then you could discount the cloud below some temp.
In its favor, I have seen some gawdawful clouds of nasty smoke coming out of some poorly maintained POS. I'd love for them to get a citation. And for a question of unanswerable cosmic significance, why do they always stop near me in a traffic light?
B