No person may operate a school bus that is painted as provided in s. 347.44 unless it is equipped with a retractable crossing gate on the front of the bus that, when in use, prevents children from crossing in front of the school bus in such proximity that they are not visible to the operator of the school bus from the operator's seat. The secretary shall prescribe rules for the specifications, installation, and operation of crossing gates required under this section.
Wis. Stat. § 347.445