More than 10,600 of the hefty gray bicycles became available for modest rental prices on Sunday at 750 self-service docking stations that provide access in eight languages. The number is to grow to 20,600 by the end of the year.

The program, Vélib (for “vélo,” bicycle, and “liberté,” freedom), is the latest in a string of European efforts to reduce the number of cars in city centers and give people incentives to choose more eco-friendly modes of transport.

“This is about revolutionizing urban culture,” said Pierre Aidenbaum, mayor of Paris’s trendy third district, which opened 15 docking stations on Sunday. “For a long time cars were associated with freedom of movement and flexibility. What we want to show people is that in many ways bicycles fulfill this role much more today.”