Michigan Compiled Laws, Chapter 257. Motor Vehicles § 257.2111

Sec. 11.(1) Subject to subsection (2), a vehicle subject to this act shall display a consistent and distinctive signage or emblem at all times while the vehicle is being used to provide transportation services or while the vehicle is being used by a transportation network company driver for a transportation network company prearranged ride or while the transportation network company driver is available to receive a transportation request.Subject to subsection (2), a vehicle subject to this act may also display a department of licensing and regulatory affairs registration number. The signage, emblem, or department of licensing and regulatory affairs registration number shall satisfy both of the following:

(2) If a limousine carrier, taxicab carrier, or transportation network company is providing services in association with a dispatch system provider, the limousine carrier, taxicab carrier, or transportation network company shall display its signage or emblem or the signage or emblem of the dispatch system provider. If a limousine carrier, taxicab carrier, or transportation network company displays the signage or emblem of a dispatch system provider as provided in this subsection, it shall also display its department of licensing and regulatory affairs registration number.

(3) If a limousine carrier, taxicab carrier, or transportation network company displays a department of licensing and regulatory affairs registration number, the 10-digit registration number shall be displayed with the “#” symbol prior to the registration number and shall use numbers and symbols that are at least 1- 1/2 inches in height.