Wis. Stat. § 194.42
The department may by order exempt from the requirements of s. 194.41 any common motor carrier of property or of passengers, or other carrier of passengers by motor bus, or contract motor carrier upon written application therefor and finding that the applicant has the financial ability to pay any and all damages, liability for which would otherwise be assumed by an indemnitor under s. 194.41. Any person so exempted shall furnish to the department from time to time such information as to financial ability as the department may require and shall promptly report to the department all accidents and injuries arising out of its operations subject to this chapter. Such exemption may be granted as to all or part of the motor vehicles operated by the applicant. The department may by order revoke any such exemption, after hearing upon 10 days' notice, and for cause. Within 10 days after the date of such order of revocation the person affected thereby shall in all respects comply with s. 194.41.
Wis. Stat. § 194.42