The portion of United States highway 69 from its junction with K-47 highway in Crawford county then north on United States highway 69 to its junction with 650th avenue is hereby designated as the Robert Lessen memorial highway. Upon compliance with Kan. Stat. Ann. § 68-10,114, and amendments thereto, the secretary of transportation shall place suitable signs along the highway right-of-way at proper intervals to indicate that the highway is the Robert Lessen memorial highway.