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A comment on Researchers find it’s easy to hack traffic lights. Parent comment

Re:Researchers find it’s easy to hack traffic lights by toomuchtodo on Wednesday August 20, 2014 @05:40PM (#8204814)
This was true back in the mechanical era when a drum was used for control; you physically could not engage multiple directions as green at the same time. I do not believe this is the case now that control is done with software/firmware.

Example Controllers: http://www.mccain-inc.com/controllers.html

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Re:Researchers find it’s easy to hack traffic lights by ams6110 on Wednesday August 20, 2014 @06:36PM (#8205052)
The controllers may be able to order it but the lights are supposed to be wired so it's impossible. E.g. grounding the green lights thorugh the cross direction green lights so you can't illuminate green in all directions at once. Or something along those lines.

edit: s/opposite/cross/

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Re:Researchers find it’s easy to hack traffic lights by azinman2 on Thursday August 21, 2014 @04:46AM (#8206469)
It would make good sense to harden it against failure, which can come in any form (software, mechanical, etc)
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