From the junction of K-9 with U.S. highway 75 south to the junction of U.S. highway 75 with K-16, is hereby designated as the Danny J. Petersen memorial highway. The secretary of transportation shall place markers along the highway right-of-way at proper intervals to indicate that the highway is the Danny J. Petersen memorial highway. The secretary of transportation may accept and administer gifts and donations to aid in obtaining suitable highway signs bearing the proper inscription.