United States highway 24 where it enters the city of Topeka on the east, then west through the city of Topeka to the point where it exits the city of Topeka on the west, is hereby designated as the Charles Sheldon trafficway. The secretary of transportation shall place signs along the highway right-of-way at proper intervals to indicate that the highway is the Charles Sheldon trafficway. The secretary of transportation may accept and administer gifts and donations to aid in obtaining and installing suitable signs.