Minn. Stat. § 161.434: INTERSTATE AND TRUNK HIGHWAY RIGHTS-OF-WAY; LIMITED USE.

The commissioner may also make such arrangements and agreements as the commissioner deems necessary in the public interest for the limited use of land owned as interstate or trunk highway right-of-way, which use shall be for highway purposes, including aesthetic purposes, but not including the erection of permanent buildings, except buildings or structures erected for the purpose of providing information to travelers through commercial and public service advertising pursuant to agreements as provided in sections 160.272 to 160.276. The commissioner shall secure the approval of the appropriate federal agency where such approval is required.