The latest Census estimates show urban counties in the Northern U.S. and Midwest, in particular, are losing residents to the suburbs and Sun Belt.
A new report suggests certain travel patterns make some cities ideal for the technology and urges officials to start planning for it.
As dozens of cities try to emulate Sweden's success, they're learning what works and what doesn't.
If transit systems want to attract more riders, they need to find ways to speed up the journey to work. See how the times compare in your metro area.