Cycling infrastructure is a hot topic in many cities around the world these days. But why should city councils spend their money on getting more people out on the bike? Because they can't afford not to. This is the only conclusion you will draw after reading Peter Walker's "How Cycling Can Save the World" - all based on thourough research and evidence. Listen to this conversation with Peter about his book, why cycling is so good for everything and why we shouldn't be so fanatic about helmets!...