(1) The commissioners are authorized to name and rename streets and roads, except state roads designated by number by the department, lying outside the boundaries of any incorporated municipality.
(2) The commissioners are authorized to refuse to approve for recording in accordance with chapter 177 any map or plat of a subdivision when recording of such plat would result in duplication of names of streets or roads or when such plat, in the opinion of the commissioners, will not provide adequate and safe access or drainage.