Notably, he says Twitter has now reconfigured its system so that traffic from mobile devices never touches any Ruby-based software at all.

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In a presentation at the Black Hat and Defcon security conference in July, for instance, French security researcher Andre Costin presented vulnerabilities in the next-generation air traffic control system known as ADS-B that he said would allow a hacker with a software-defined radio to track and even spoof planes in the sky, potentially creating dangerous distractions for pilots.

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Under the new system, software will analyze the entire Norfolk network every hour and, to keep traffic flowing efficiently, suggest changes in speed, routing and train meeting places.

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