Wis. Stat. § 194.17
Every common motor carrier of property or of passengers, every contract motor carrier and every private motor carrier to which this chapter applies and every person who operates without obtaining a certificate under s. 194.23 or license under s. 194.34, except a license for transporting exempt commodities, or without meeting the insurance requirements under s. 194.41, shall forfeit not less than $500 nor more than $5,000. Any person who violates any other provisions of this chapter including the requirement to obtain a license to transport exempt commodities or the requirement to obtain a permit or who violates orders issued by the division of hearings and appeals or orders or rules issued by the secretary shall forfeit not less than $50 nor more than $100. Each violation constitutes a separate offense. In construing and enforcing the provisions of this section, the act, omission or failure of any officer, agent or servant or other person acting for or employed by any common motor carrier of property or of passengers, any contract motor carrier or any private motor carrier, done within the scope of employment is deemed to be the act, omission, or failure of the common motor carrier of property or of passengers, contract motor carrier or private motor carrier.
Wis. Stat. § 194.17