Wis. Stat. § 121.545: Additional transportation.

(1) The parent or guardian of a pupil who attends a public or private school and who is not required to be transported under s. 121.54 may contract with the school board of the district for transportation under this subsection. The school board of the district may provide transportation under this subsection to a pupil not required to be transported under s. 121.54, if requested to do so by the parent or guardian of the pupil. The school board may charge a fee for the cost of providing transportation under this subsection and may waive the fee or any portion of the fee for any person who is unable to pay the fee. State aid shall not be provided for transportation under this subsection.

(2) A school board may provide transportation for children residing in the school district whom the school district is not required to transport under s. 121.54 to or from, or both, a before- and after-school child care program under s. 120.125, a prekindergarten class under s. 120.13 (13), a child care program under s. 120.13 (14), or any other child care program, family child care home, child care provider, or prekindergarten class. The school board may charge a fee for the cost of providing such transportation. The school board may waive the fee or any portion of the fee for any person who is unable to pay the fee. State aid shall not be provided for transportation under this subsection.