(1) The portion of highway I-75 within the state of Michigan shall be known as the "Tuskegee Airmen Memorial Highway".

    (2) If sufficient private contributions are received to pay the cost of erecting and maintaining suitable markers for the highway described in this section as provided in section 2, those markers shall only be placed along highway I-75 within 5 miles of the following 2 locations:

    (a) The border between Michigan and Ohio.

    (b) The border between Michigan and Canada.