A statewide regulation limits school bus idling and other idling at or near public and private schools engaged in the education of pupils at or below the 12th grade level, regardless of fuel type and whether or not children are present or school is in session (13 CCR 2480). When at School, school bus, transit bus, and commercial motor vehicle drivers are required to turn off the engine upon arriving at a school, and restart it no more than 30 seconds before departing. When Within 100 Feet of a School, school bus drivers are required to turn off the engine when within 100 feet of a school, and restart it no more than 30 seconds before departing. Transit buses and commercial motor vehicles are prohibited from idling for more than 5 minutes. Other Locations Beyond 100 Feet of a School, school bus drivers are prohibited from idling more than 5 minutes at locations beyond schools, such as school bus stops, or school activity destinations. In addition, another regulation that applies to commercial diesel vehicles prohibits idling a vehicle’s engine for more than 5 minutes at any location (13 CCR 2485).