(1) “State highway” shall mean and include all roads and highways taken over by the Commonwealth as State highways under the provisions of any act of Assembly. Unless clearly so intended, the term shall not include any street in any city, borough or incorporated town, even though the same may have been taken over as a State highway.

(2) “Rural State highway system” shall mean and include all roads and highways taken over by the Commonwealth as State highways under the provisions of the act, approved the twenty-second day of June, one thousand nine hundred thirty-one (Pamphlet Laws, five hundred ninety-four), act number two hundred three, entitled “An act establishing certain township roads as State highways; authorizing their construction, maintenance, and improvement under certain conditions and restrictions; limiting the obligation of the Commonwealth in the construction of certain structures located on such highways; conferring certain powers upon the Department of Highways and local authorities, persons, associations and corporations for sharing the cost of the maintenance and construction of such highways; and making an appropriation to carry out the provisions of said act,” and its supplements and amendments,¹ and all other roads and highways specifically designated as rural State highways.

(3) “Department” shall mean the Department of Highways of the Commonwealth.

(4) “Secretary” shall mean the Secretary of Highways of the Commonwealth.