If the security system detects an invalid state, it immediately disables the traffic light (blinking yellow), and someone has to drive out there and press the reset button.
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Totally makes up for unencrypted communication and default passwords that cannot be changed because they're hardcoded into the central control software. :)
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Also, I'm totally lying: it's a safety system, which just happens to stop security issues.
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That sounds super interesting, do you know of any resources for learning more about this?
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Google "green lights forever, work by UMich.
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Railway signalling (at least here) is comparable. Even with some software introduced, it's old-school electronic interlocks that safeguard most signalling centres
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Those times will be over soon.
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No doubt
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If you get a green green conflict in the UK the lights switch off.
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Movies have lied to me! LIED! I've seen hackers turn all lights green! LIES! *sobs until he falls asleep*
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(For real though, that's pretty cool. Despite the movies lying to me. I weep.)
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This sounds like ISO 26262, but I don't know if there is an equivalent for infrastructure.
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Same with train signalling (which traffic lights are based on). The base level of logic is provided by physical relays. The software can have a gazillion bugs but the relay interlock can't do what it's been hard wired not to do. https://en.m.wikipedia.org/wiki/Interlocking …
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barring hardware rewire
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