Section 1. Be It Enacted, &c., That in Order to Secure Coördinated,

comprehensive plans of highways and roads, parks and parkways, and all other means of intercommunication, water-supply, sewerage and sewage disposal, collection and disposal of garbage, housing, sanitation and health playgrounds, civic centers, and other public improvements, as hereinafter provided for, the districts surrounding and within twenty-five miles of the limits of cities of the first class, whether in one or more counties, and in order to prevent waste by unnecessary duplication, the areas included within twenty-five miles of the limits of cities of the first class shall be denominated the Suburban Metropolitan Districts of cities of the first class of Pennsylvania. When any city, borough, or township is partly within and partly without the twenty-five mile limit, the whole of such city, borough, or township shall be regarded as within the Suburban Metropolitan District.