Monitor: A pickup truck cruises the highway and suddenly unleashes a plume of thick, black exhaust on a pedestrian or car and, in its way, sends a political message:
The "war on coal" and environmental regulation generally has prompted a tailpipe rebellion.
Some drivers are spending hundreds or thousands of dollars to bypass the environmental controls on their vehicles and blow dirty exhaust into the atmosphere. The installations can include large stacks on the back of pickups, according to various...