As may hereinafter be provided in this act, the counties of Wayne, Washtenaw, Livingston, Oakland, and Macomb, or certain of such counties, may by vote of the electorate thereof, join to form a metropolitan district as a body corporate, to be known as the Huron-Clinton metropolitan authority, for the purpose of planning, promoting, and/or for acquiring, constructing, owning, developing, maintaining and operating, either within or without their limits, parks and/or limited access highways, as well as such connecting drives as may be deemed necessary or convenient to provide access to and between the same.