Over the last five years World Streets has published close to 100 articles looking at carsharing status and prospects in around 20 different countries on all continents. We are now undertaking to update this series, starting with an excellent contribution just in on how carsharing is developing (and developing fast) in the Netherlands which you can see today at http://worldstreets.org.
In this case, the elected officials and all senior administrative personnel undertake to travel to work one day a week by some means of transportation other than a private car. This constraint will be either something decided by a farsighted political leader, or otherwise the result of strong electoral pressure from a number of public interest groups who get together to ensure that this will be part of the electoral victory package. It could work like this.