Speed limits for mode shifts
From the Telegraph:
15mph speed limit to force people out of cars
The UK is planning a series of 15 new "eco-towns". As part of their design, a 15mph (Britain is not consistently metric) speed limit in the heart of these new towns hopes to discourage auto use, in stark contrast to the older new towns (Stevanage to Milton Keynes) which made freeflowing traffic a centerpiece.