Over half of the world's population live in cities, and rapid urbanisation is only expected to increase in the coming years. By 2050, large cities in the USA, China and India are predicted to see their populations increase by 33 per cent, 38 per cent and 96 per cent respectively. Population growth in cities means increasing demands on transport systems.
What health gains could be achieved if cities shifted from private car use to cycling and walking? What if a "compact city" model was promoted, where distances to shops and facilities, including public transport, are shorter and within walking distance?