This chapter does not impair the authority or responsibility of a political subdivision with regard to the local enforcement of licensing, safety, or police regulations authorized by local ordinance or state law if the department determines that the standards employed by the political subdivision are at least equal to those adopted by the department. The authority of a political subdivision for the licensing, safety, or police regulation of devices extends to a point five miles outside the territorial limits of the political subdivision if no other political subdivision of the state is exercising similar authority over the same devices.