Cities around the world are being wrecked by the ever-increasing burden of traffic. A significant part of the problem is the enduring popularity of the private car - still an attractive and convenient option to many, who turn a blind eye to the environmental and public health impact. Public transport has always seemed to take second place to the car, and yet alternative ways of moving around cities are possible. Measures to improve public transport, as well as initiatives to encourage walking and cycling, have been introduced in many large cities to decrease car use, or at least persuade...