The financial and ecological costs of driving, and the time we waste sitting in traffic jams, is leading many people to think about a more ‘walkable’ city. The man who has thought and written most widely on this is city planner and architectural designer Jeff Speck. In rural, tribal societies with no technology, people move on average at three miles per hour because they are walking everywhere. In most developed countries, if you add up the costs of driving a car, the time you spend earning that money and the time you spend in traffic, it has been estimated that we, too, move at about 3 miles per hour! We have learned that we have a smaller carbon footprint and a healthier population if we live in walkable cities. City centres are changing fast and they are increasingly seen as desirable places to live. But the city councils and planners keep wanting to build more roads.