Lane inspector Alex Davidson covers the apparatus for measuring auto emissions in the tail pipe of the next vehicle at the Air Care Colorado Emissions Testing Center in Broomfield in 2010.
Colorado is riding hard on diesel truck drivers who "roll coal," the politically charged display of power on the roads that has doused other vehicles, such as environmentally friendly Priuses, and pedestrians, including supporters of presidential candidate Hillary Clinton, with sooty black smoke.
Gov. John Hickenlooper this week said he'll gladly sign into law a bill lawmakers passed that lets police hit offenders with $100 fines.
"Coal rolling is a cruel cut to people with asthma or other respiratory issues," Hickenlooper said. "We are well to be rid of it."