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activities adequate aircraft airlines airports Allegheny County automobile aviation Budd Company buses Canal cargo carrier centers cities COMMITTEE FOR TRANSPORTATION COMMON CARRIER Commonwealth of Pennsylvania communities congestion construction containerization coordinated corridors Delaware River Port Department of Highways Department of Transportation economic Federal Federal Aviation Administration Figure FlGURE freeways GOVERNOR'S COMMITTEE growth handling Harrisburg highway network improvements increase industrial intercity passenger land major mass transit ment metropolitan areas miles million mobility modes Monongahela Rivers movements nation NSYLVANIA operation parking patterns Penn Central Railroad Pennsyl Pennsylvania Department Pennsylvania Railroad percent Philadelphia pipeline pipeline transportation Pittsburgh policies Port of Erie portation rail railroads recreational River Port Authority roads routes safety scheduled SOURCE State's TONS traffic trans transit service transportation facilities transportation planning Transportation Study transportation system trip trucks U.S. ARMY U.S. Bureau U.S. Department urban areas vehicles WATERBORNE COMMERCE waterways western Pennsylvania York