How to get America to walk

US cities built in the 20th Century have long catered for a population that prefers to take the car to shop, dine and work. But an ageing population and a young professional workforce looking for an urban lifestyle have forced city planners to reconsider the existing road and pavement infrastructure.

But how do you remake a city into a pedestrian dream, and how do you re-educate the public about its transportation choices?

The BBC's Franz Strasser went to Raleigh, North Carolina, where an unsanctioned street sign campaign called Walk Raleigh caught the attention of city officials and pedestrians alike.

Night video courtesy of Matt Tomasulo.