Minn. Stat. § 360.86: VISUAL OR AURAL IDENTIFICATION.

Every permit granted shall also specify what, if any, obstruction markers, markings, lighting, or other visual or aural identification shall be installed on or in the vicinity of the structure. Such identification characteristics required shall conform to federal laws and regulations where applicable; however, a higher standard of identification may be required under sections 360.81 to 360.91.