Michigan Compiled Laws, Chapter 500. Insurance Code of 1956 § 500.3136

Sec. 3136.  (1) In addition to the exceptions expressed in section 3135,  1 the abolition of tort liability under that section does not apply to damage to tangible property arising from 1 accident in excess of the limit in section 3121   2 for which liability insurance required by federal statute or regulation is in effect.

(2) The exception provided by subsection (1) is limited to the amount of the applicable limit under the insurance policy in effect less the limit under section 3121 or $4,000,000.00 in excess of the limit under section 3121, whichever is less.