Mexico City has a Healthy Government
The mayor of Mexico City, Marcelo Ebrard, has ordered all government officials to find a greener way to work one day a month. He has banned workers from using their car to commute, and insisted that people either cycle or take public transport.
According to New Scientist, even those workers who are in poor health are not exempt, and must still use public transport. That's quite a bold move, but only one day a month seems like it won't make much of a difference.
Perhaps this kind of authoritarian approach will be more effective than schemes that try to make cycling seem more attractive, maybe the threat of punishment is a stronger influencer than marketing. What the article doesn't say is how the employees are going to be monitored to stop cheating, and what the repercussions will be.
Once people are forced to explore the alternatives to driving to work they may realize that cycling to work can even be more convenient. I would imagine that cycling to work in sunny Mexico City would be quite enjoyable...