NASA is developing an air traffic control system for drones. The New York Times reports the US space agency is working on creating a management system for vehicles that fly at around 400 to 500 feet off the ground — much lower than conventional aircraft — at its Moffett Field base around four miles from Googles Mountain View headquarters. The system would check for other low-flying drone traffic, help the small unmanned vehicles avoid buildings, and scan for adverse weather conditions that might knock a drone out of the sky. NASAs drone traffic control centers will be automated