You should Google the EPA and emissions standards for highway trucks and educate yourself. With the DPFs (diesel particulate filter) and DEF (diesel exhaust fluid) systems, trucks now burn cleaner than most cars. And, in a lot states, they are strictly enforcing the 5 minute idle law. They will make you shut off the truck, period. Oh, and write you a ticket with a big fine. Just a little information, how do you think your ice cream gets to your local store, still frozen. A diesel powered refrigerated trailer that has to run almost constantly. Enjoy that next bowl or ice cream cone.