Mich. Comp. Laws § 257.611a: Direction of traffic in work zone; conditions; failure to comply; violation as civil infraction.

Sec. 611a.

(1) An owner or employee of an entity performing construction, maintenance, surveying, or utility work within a work zone may direct traffic within that work zone if both of the following apply:

(a) The department of transportation, the local authority, or the county road commission, within its respective jurisdiction, authorizes that owner or employee to direct traffic due to safety or work requirements. The authorization shall be issued in the manner considered appropriate by the department of transportation, the local authority, or the county road commission, and may be general or specific. The authorization may establish the conditions under which the owner or employee may direct traffic, and may allow the owner or employee to direct traffic in disregard of an existing traffic control device.

(b) The owner or employee is properly trained, equipped, and attired in conformance with the manual of uniform traffic control devices authorized under section 608.

(2) The operator of a motor vehicle who fails to comply with the directions of an owner or employee directing traffic under this section, including a direction made in disregard of an existing traffic control device, is responsible for a civil infraction.