How seven cities are inventing the future of transportation

How do you get to the city of the future? Seven cities have spent six months racing to answer that question. They’re vying for a $40 million start-up prize from the U.S. Department of Transportation, which asked them to juggle three big ideas: automation, climate change and urban inequality. But even without the federal cash or “Smart City” crown, city officials say big changes are coming faster than people realize.