Wis. Admin. Code § Trans 300.19
The owner of every vehicle identified as a school bus by color, signs, and lights which is converted from a school bus to some other type of vehicle shall comply with the following requirements:
History: Cr. Register, February, 1983, No. 326, eff. 3-1-83; am. (2), Register, December, 1997, No. 504, eff. 11-98; CR 03-116: cr. (5) Register April 2004 No. 580, eff. 5-1-04.