\" \" Students walk to school in San Diego, California on the first day of school, Sept. 7, 2010. Sandy Huffaker/Corbis via Getty ImagesBack in 1969, 48 percent of kids in America walked or biked to school, compared with a paltry 13 percent in 2009. AdvertisementAdvertisementFor the older children, walking to school unaccompanied provided a lot of benefits. (Nevertheless, only 35 percent of kids who lived within a mile in 2009 walked or cycled to school.) \"Also, if your child's route is more than a mile, there are no sidewalks or numerous street crossings, walking to school may not be the best option.\"