What to do if you spot a driver ‘rolling coal’ on Colorado roads

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2min 10sec
Exhaust from a truck
Business Wire
Exhaust from a diesel truck on April 20, 2018. In 2017, then-Governor John Hickenlooper signed into law a bill penalizing coal rollers. Coal rolling is when people driving cars and trucks intentionally produce black clouds of exhaust. Colorado lawmakers determined it was a road, health and safety hazard.

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