clipped from: www.startribune.com   
As gas nears $4, Minneapolis eyes limits on engine idling

Minneapolis City Council members today will hear from city staff members about a proposed ordinance to restrict vehicle idling in most cases to 3 minutes.

The new ordinance is designed to improve air quality," said a news release from the city. "If approved, the measure would make it illegal in most cases to allow a car to idle (except while in traffic) for more than 3 minutes."