Michigan Compiled Laws, Chapter 257. Motor Vehicles § 257.658b

Sec. 658b. (1) Except as provided in subsection (2), a person operating or riding in a low-speed vehicle shall wear a crash helmet on his or her head. The crash helmet shall meet the requirements of the rules promulgated by the department of state police under section 658.  1

(2) Subsection (1) does not apply to a person operating or riding in a low-speed vehicle equipped with a roof that meets or exceeds the standards for roof-crush resistance, provided under 49 C.F.R. 571.500.