Wis. Stat. § 121.56
The school board of each district shall make and be responsible for all necessary provisions for the transportation of pupils, including establishment, administration and scheduling of school bus routes. Upon the request of any school board, the state superintendent shall provide advice and counsel on problems of school transportation. Any private school shall, upon the request of the public school officials, supply all necessary information and reports. The transportation of public and private school pupils shall be effectively coordinated to insure the safety and welfare of the pupils. Upon receipt of a signed order from the state superintendent, the school board shall discontinue any route specified by the state superintendent.
Wis. Stat. § 121.56
The refusal by a public school board to transport parochial pupils during a public school vacation violated s. 121.54(2) (b) 1 Hahner v. Wisconsin Rapids Board of Education, 89 Wis. 2d 180, 278 N.W.2d 474 (Ct. App. 1979).