It's called State Senate bill 2418, and it's just been signed by New Jersey Governor Chris Christie. What does it involve? It makes the practice of rolling coal illegal in the state of New Jersey. For those unaccustomed with the practice, coal rolling essentially involves modifying a diesel-powered vehicle, typically trucks and SUVs, so that it'll spew lots of black soot and smoke into the air. "Coal rolling increases air pollution in New Jersey and creates unsafe driving conditions on New Jersey's already congested roadways," stated Assemblyman Tim Eustace.

For the record, Eustace drives a Nissan Leaf. Eustace got the idea for the new law after a lifted truck driving in front of him engulfed his car in a black smoke cloud.

The new bill makes it now illegal to "retrofit any diesel-powered vehicle with any device, smoke stack, or other equipment which enhances the vehicle's capacity to emit soot, smoke, or other particulate emissions...into the air and onto roadways and other vehicles while operating the vehicle, colloquially referred to as 'coal rolling.' " A first offense penalty could cost as much as $5,000.