Most states require the use of school buses to transport children to and from school and school-related events, but some states do not. NHTSA recommends that preschool and school-age children not be transported in 15-passenger vans. The 2005 federal highway reauthorization act prohibits pre-primary, primary, and secondary schools from purchasing, renting, or leasing new 15-passenger vans to be used significantly to transport students to and from school and school-related activities unless the vans meet the federal standards for school buses or multifunctional school activity buses. ...In August 2003, NHTSA amended the school bus safety regulations to encourage churches and other groups to use buses instead of vans.10