US space agency Nasa is moving into the final phase of its four-year programme to prove that it can safely control drones flying over urban centres.
Drones, less commonly called unmanned aircraft systems (UAS), are likely to form an increasing proportion of the transportation mix for future cities, but questions remain over their safety – particularly in built-up, heavily populated areas.
Nasa will test them in two areas – the gambling hotspot of Reno, Nevada, and the Texan city of Corpus Christi.
