benefits have been overwhelmingly positive report on the 40th anniversary of the highway system: finished three decades ago infrastructure infrastructure http://www.publicpurpose.com/freeway1.htm http://www.publicpurpose.com/freeway1.htm#intro http://www.publicpurpose.com/freeway1.htm $58.5 billion 1957 $58.5 billion 1957 The US Interstate Highway System: 40 Year Report a national security measure analysts largest public works program in history peak of $38 billion annually to the U.S. economy infrastructure forty year report http://www.publicpurpose.com/freeway1.htm 40 Years of the US Interstate Highway System http://www.publicpurpose.com/freeway1.htm Public Purpose http://www.publicpurpose.com/freeway1.htm#intro http://www.publicpurpose.com/freeway1.htm report on the 40th anniversary of the highway system: peak of $38 billion annually to the U.S. economy $58.5 billion 1957 http://www.publicpurpose.com/freeway1.htm#intro peak of $38 billion annually to the U.S. economy http://www.publicpurpose.com/freeway1.htm#intro a national security measure Public Purpose Massive Report of Evidence largest public works program in history 6,000 lives an estimate http://www.publicpurpose.com/freeway1.htm mostly completed 6,000 lives This study largest public works program in history heroic levels infrastructure a national security measure report on the 40th anniversary of the highway system: analysis http://www.publicpurpose.com/freeway1.htm#intro http://www.publicpurpose.com/freeway1.htm Public Purpose Public Purpose finished three decades ago