But wait, I thought bikes were impractical!

Taxi drivers and other critics said that it would never work, but three weeks after Paris was sprinkled with 10,000 self-service bicycles, the scheme is proving a triumph and a new pedalling army appears to be taming the city’s famously fierce traffic.

Bertrand Delanoë, the city’s mayor, and his green-minded administration are jubilant at the gusto with which Parisians and visitors have taken to the heavy grey cycles that have been available at 750 ranks since July 15.

Grist thanks its sponsors. Become one.