That's not due to poor maintenance in a lot of cases these days. Google 'Rolling... | Hacker News

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		X-Istence on Oct 5, 2015 \| parent \| context \| favorite \| on: VW Scandal Will Speed Up Diesel's Demise That's not due to poor maintenance in a lot of cases these days. Google 'Rolling coal'.

ansible on Oct 6, 2015 [–]

Sigh. I didn't know that was a thing. How obnoxious.

Anyway, mostly it is construction and semi trucks I see blowing black smoke. Usually they are really rusted out anyway, hence the lack of maintenance comment.

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