What are the risks during transportation to and from schools?: World Health Organization

The following adaptations to transport to and from school should be implemented to limit unnecessary exposure of school or staff members.

• Promote and put in place respiratory and hand hygiene, physical distancing measures and use of masks in transportation such as school buses, in accordance with local policy.

• Provide tips for how to safely commute to and from school, including for public transportation.

• Organize only one child per seat and ensure physical distancing of at least 1 meter between passengers in school buses, if possible. This may require more school buses per school.

• If possible and safe, keep the windows of the buses, vans, and other vehicles open.

reference: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/question-and-answers-hub/q-a-detail/coronavirus-disease-covid-19-schools