ELI5: Explain Like I'm 5

Walking bus

A walking bus is a group of children who walk to school together with one or two grown-ups. The grown-up is like a bus driver and the children are like passengers on a bus, but instead of riding on a bus, they walk. Walking buses help children get to school safely, while also getting some exercise. The grown-up makes sure each child is ready to go when it's time to leave and that everyone arrives at school safely.