Wis. Stat. § 341.085: Registration of ambulances.

(1) The department shall inspect all ambulances prior to issuing an original or renewal registration to determine that the vehicles meet requirements specified by law or administrative rule as to specifications, medical equipment, supplies and sanitation.

(2) The department may adopt rules necessary for administration of this section and prescribe ambulance service equipment and standards therefor, except that any ambulance which does not conform to rules adopted by the department may be used until December 30, 1979.