The city’s energy committee has launched “Medford Idle-Free,” a campaign to educate motorists about the dangers of leaving a vehicle running. The effort drives home three main points: State law makes it illegal for drivers to keep a car idling for more than five minutes; vehicle emissions contribute to asthma and other public health issues; gas and money are wasted. Public outreach started in June, when informational fliers were sent home with public school children. Now fliers are being distributed to day-care centers, and other businesses and organizations where drivers drop off or pick up people. “Whether you are behind the wheel of a school bus, a delivery truck, an SUV, or a car, you should turn off the engine,” Mayor Michael J. McGlynn said in a prepared statement announcing the program. For more information, visit www.medford.org/idle-free.