(1)    No permit or vehicle registration may be issued to a common motor carrier of property, contract motor carrier, or rental company, no permit or vehicle registration may remain in force to operate any motor vehicle under the authority of this chapter, and no vehicle registration may be issued or remain in force for a semitrailer unless the carrier or rental company has on file with the department and in effect an approved certificate for a policy of insurance or other written contract in such form and containing such terms and conditions as may be approved by the department issued by an insurer authorized to do a surety or automobile liability business in this state under which the insurer assumes the liability prescribed by this section with respect to the operation of such motor vehicles. The certificate or other contract is subject to the approval of the department and shall provide that the insurer shall be directly liable for and shall pay all damages for injuries to or for the death of persons or for injuries to or destruction of property that may be recovered against the owner or operator of any such motor vehicles by reason of the negligent operation thereof in such amount as the department may require. Liability may be restricted so as to be inapplicable to damage claims on account of injury to or destruction of property transported, but the department may require, and with respect to a carrier transporting a building, as defined in s. 348.27 (12m) (a) 1., shall require, a certificate or other contract protecting the owner of the property transported by carriers from loss or damage in the amount and under the conditions as the department may require. No permit or vehicle registration may be issued to a common motor carrier of passengers by any motor vehicle, or other carrier of passengers by motor bus, except those registered in accordance with s. 341.26 (2) (a) and (d), and no permit or vehicle registration may remain in force to operate any motor vehicle unless it has on file with the department a like certificate or other contract in the form and containing the terms and conditions as may be approved by the department for the payment of damages for injuries to property and injuries to or for the death of persons, including passengers, in the amounts as the department may require. This subsection does not apply to a motor carrier that is registered by another state under the unified carrier registration system consistent with the standards under 49 U.S. Code § 13908 and 14504a.

   (2)   No certificate or other contract filed under this section may be limited as to the total liability of the insurer thereunder, for any series of accidents, and no such certificate or other contract may be terminated at any time prior to its expiration under the terms thereof, nor canceled for any reason whatever, unless there has been filed with the department by the insurer a notice thereof at least 30 days prior to the date of termination or cancellation. The 30-day notice may be waived if an acceptable replacement has been filed under this section.

   (3)   The provisions of this section shall be deemed a part of every such certificate or other contract and no other provision thereof or agreement between the parties thereto may operate to avoid the same.

   (4)   The department shall adopt rules for the administration and enforcement of this section and the secretary may appoint any employee in the department as a representative to affix the secretary’s signature, including any facsimile signature adopted by the secretary, to administrative letters, notices and orders to enforce this section.

   (5)   The department of transportation may require blanket filings of insurance, subject to such rules as the department may adopt.

   (6)   

      (a)    Except as provided under par. (b), the minimum insurance required under sub. (1) is the minimum level of insurance established under 49 U.S. Code § 13906 (a) (1).

      (b)   

         1.    The minimum insurance required under sub. (1) for a vehicle with a gross weight of 10,000 pounds or less is $300,000 unless the vehicle is transporting hazardous materials as listed under 49 C.F.R. 172.101, in which case the minimum insurance requirements under par. (a) apply.

         2.    The minimum insurance required under sub. (1) for a taxicab operating under this chapter is the minimum levels of liability insurance for bodily injury and property damage required by the local taxicab licensing or regulating ordinance applicable to such taxicab. No such local ordinance may establish minimum levels of liability insurance which are less than those required for a policy or bond under s. 344.15 (1). If no minimum levels of liability insurance are established by such local ordinance, the minimum levels are the same as the levels required for a policy or bond under s. 344.15 (1).

         3.    Notwithstanding subd. 1., the minimum insurance required under sub. (1) for a motor carrier of passengers operating under this chapter solely in intrastate commerce is the following:

            a.    For a motor vehicle with a passenger-carrying capacity of 15 or fewer passengers, $500,000.

            b.    For a motor vehicle with a passenger-carrying capacity of 16 or more passengers, $1,000,000.