A bicycle rodeo is a great way to protect your kids and encourage bicycle riding. 
This link http://www.bicyclinglife.com/SafetySkills/BicycleRodeo.htm will get you started learning how to put on a bicycle rodeo.  You can pick a date to have it in the school parking lot.  Once your students have learned the safety rules, ask them to talk their parents into riding to and from school.  It's great exercise for the entire family and great for the Earth.
Many parents of course work.  Perhaps they can find a friend who will help as a biking riding partner.  It's a good excuse to exercise!