In this chapter,

(1) “automobile graveyard” means an establishment or place of business which is maintained, used, or operated primarily for storing, keeping, buying, or selling wrecked, scrapped, ruined, or dismantled motor vehicles or motor vehicle parts;

(2) “interstate system” means that portion of the National System of Interstate and Defense Highways located in this state, as officially designated, or as may hereafter be so designated, by the commissioner and approved by the United States Secretary of Transportation (or by the United States Secretary of Commerce before the effective date of the transfer of functions under Public Law 89-670 [80 Stat. 931]), under the provisions of 23 U.S.C;

(3) “junk” means used or scrap rope, rags, batteries, paper, trash, rubber, debris or waste, junked, dismantled, or wrecked automobiles, or parts thereof, or used or scrap iron, steel, copper, brass, and other ferrous or nonferrous metals;

(4) “junk yard” means an establishment or place of business, private or public, which is maintained, operated, or used primarily for storing, keeping, buying, or selling junk, or for the maintenance or operation of an automobile graveyard, and the term includes garbage dumps and sanitary fills;

(5) “primary system” or “secondary system” means that portion of connected main highways, as officially designated, or as may hereafter be so designated, by the commissioner, and approved by the United States Secretary of Transportation (or by the United States Secretary of Commerce before the effective date of the transfer of functions under Public Law 89-670 [80 Stat. 931]), under the provisions of 23 U.S.C.