The California Department of Education document Sustainable Communities and School Planning has a section on promoting active transportation.
“Promoting Active Transportation: Safe routes to school promote active forms of transportation (e.g., walking and biking) with associated health benefits and reduced pollution and traffic near schools. Creating safe routes by removing existing barriers or mitigating safety issues is much more difficult and expensive to accomplish after construction than if the school is originally sited and designed correctly. Working with local traffic planners is critical, and help is available in the form of technical resources, training, and funding from a variety of sources. District efforts may involve walkability audits, surveys on modes of transportation, safety curriculum, and program development such as the “walking school bus” and bicycle “train ” (students accompanied by adults walking or bicycling on a safe route) and infrastructure or safety projects such as bike and skateboard racks, sidewalks, bike lanes, and lighting improvements.”