Interstate highway 335 from junction of interstate highway 335 with interstate highway 470 south to the junction of interstate highway 335 with interstate highway 35 is hereby designated the United States submarine veterans memorial highway. The Kansas turnpike authority shall place signs along the highway right-of-way at proper intervals to indicate that the highway is the United States submarine veterans memorial highway, except that such signs shall not be placed until the Kansas turnpike authority has received sufficient moneys from gifts and donations to reimburse the Kansas turnpike authority for the cost of placing such signs and an additional 50% of the initial cost to defray future maintenance or replacement costs of such signs. The Kansas turnpike authority may accept and administer gifts and donations to aid in obtaining and installing suitable signs.