of physical activity and better cardiovascular fitness than do children who do not actively commute to school. In a study of adolescents, 100% of the students who walked both to and from school met the recommended levels of 60 or more minutes of moderate to vigorous physical activity on weekdays. In a pilot, randomized controlled trial (RCT) in Houston, Texas, children that were assigned to a Walking School Bus group increased their weekly rate of active commuting by 38.0% over a five-week period, while children assigned to a no intervention group decreased their active commuting rate by a small margin. Policies and regulations In 2005, the US Federal Transportation Reauthorization Bill—The Safe, Accountable, Flexible, Efficient Transportation Equity Act (SAFETEA-LU 109-59) was passed which provided nearly $1 billion funding to all states for Safe Routes to School (SRTS) programs. The program's purpose is to: “enable and encourage children, including those with disabilities, to walk and bicycle to school; to make walking and bicycling to school safe and more appealing; and to facilitate the planning, development and implementation of projects that will improve safety, and reduce traffic, fuel consumption, and air pollution in the vicinity of schools.” It is a 100% federally funded program which is administered by state departments of transportation. Money goes towards infrastructure-related programs in addition to non-infrastructure activities such as education and enforcement-year time period, restricting data to school-travel hours. This law is central to the success of programs like the Walking Bus because it identifies the many components involved. Active transport to school and examples such as the walking school bus require collaboration from many different sectors (transportation, law enforcement, school policies, and local government to name a few). In addition, the ability to create an environment conducive to walkability is dependent on the built environment as well as numerous policies from these various sectors. According to the Institute of Medicine Report, Measuring Progress in Obesity Prevention, the environment people live in can have a profound effect on the amount of physical activity which they engage in. According to James Sallis in his workshop presentation, informal or formal policies issued by the government or private sector, can affect physical activity in four ways. First, zoning, building codes, public transportation and recreational facility policies affect the ability to engage in physical activity. Second, policies affecting physical activity in schools—physical education classes, recess, and walkability to and from school.