Here's the letter of the law on Michigan CDL requirements, right from the source, the Michigan Vehicle Code.
Within the Michigan Vehicle Code, it is in Section 257.312e. See #13.
http://www.legislature.mi.gov/(S(2u51lyj0dhvoen25g0vpqjaq))/mileg.aspx?page=getObject&objectName=mcl-257-312e
Here is the link to the base page of the vehicle code
http://www.legislature.mi.gov/(S(2u51lyj0dhvoen25g0vpqjaq))/mileg.aspx?page=getobject&objectname=mcl-act-300-of-1949&queryid=941043&highlight=
If you want a down and dirty single page to print out, here is a link to a pdf file that lists section 257.312e.
http://www.michigan.gov/documents/co...nse_8574_7.pdf
