Once upon a time, tractor pull attendees who witnessed diesels churn out black smoke under the strain of a very heavy trailer decided to make their diesel-powered pickups do the same thing, sans said heavy trailer. The practice came to be known as “rolling coal,” and until last week, was nothing more than a potential subject for a country song or two amid lyrics about drinking lots of beer and getting with the blue-eyed blonde of the singer(s) dream(s).
However, rolling coal has taken on a political guise as of late, usually (and literally) aimed at Prius owners allegedly trying to force their asphalt realities upon the coal enthusiasts. Of course, the Environmental Protection Agency has something to say about the whole thing: No.
Jalopnik subsidiary Truck Yeah! reports Talking Points Memo got a hold of EPA representative Liz Purchia about the legalities of pretending to be a 19th century choo-choo train on the highways of the 21st century. In short: rolling coal is a violation of the Clean Air Act. The systems used to create black smoke on purpose, including computer software “that alters diesel fuel injection timing,” are illegally overriding emissions control, something the CAA frowns upon, to say the least.
That said, enforcement of the CAA is on the manufacturer level; thus, while it is illegal to roll the coal down that old dirt road, the only punitive action may come from the police officer who just had a ton of black smoke blown directly in their face.