In a three-part radio series, the BBC has taken an in-depth look at the bicycle's role in the social, cultural, and economic fabric of three very different communities. 

• image: BBC

  Part one focuses on Paris and the city's new bike-sharing system.
• Part two moves to Kalampa, Uganda exploring the residents' reliance and attachment to their bikes.
• Part three wraps up in New Dehli, India and examines the economic impact of bicycles in the city.

The documentary is well worth a listen, not only for its insights into the bicycle as vital transportation, but as a glimpse into three very different worlds.