I guess there are going to be a lot of ruined diesel motors in California:
FACTS ABOUT
California’s Commercial Vehicle Idling Regulations
Idling diesel trucks and buses create toxic air pollution, contribute to global warming, and waste costly fuel – and in some cases, the operator may be breaking the law. Find out how you can help keep emissions in check so we can all breathe easier.
Which vehicles are covered?
Heavy-duty diesel vehicles with a Gross Vehicle Weight Rating (GVWR) of 10,000 lbs. or heavier.
How long can I idle?
Idling for more than 5 minutes is prohibited within California’s borders. While at a school, the driver must shut down the engine immediately upon arrival and leave within 30 seconds of starting the engine.
http://www.arb.ca.gov/msprog/truck-idling/factsheet.pdf