Walking School Bus is a simple concept that is growing in popularity across the United States and parts of Europe. In cities across the country, local groups provide guidance and support to communities who wish to implement the initiative, as it has proven benefits for children and for the community as a whole. National organizations, such as the Safe Routes to School Partnerships, also promote Walking School Bus because of the many benefits of the model. They are encouraged because walking to school produces less traffic in the mornings and fewer emissions in the school area. Many groups also advocate for activities such as Walking School Buses because of the health benefits, both physical and psychological, associated with more exercise during the school day.