Simon Rogers: “US road accident casualties: every one mapped across America – 369,629 people died on America’s roads between 2001 and 2009. Following its analysis of UK casualties last week, transport data mapping experts ITO World have taken the official data from the National Highway Traffic Safety Administration – and produced this powerful map using OpenStreetMap. You can zoom around the map using the controls on the left or search for your town using the box on the right – and the key is on the top left. Each dot represents a life.”