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Avril Lavigne replacement conspiracy theory (en.wikipedia.org)

submitted 2 years ago by Plum@lemmy.world to c/wikipedia@lemmy.world

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[–] Metype@lemmy.world 5 points 2 years ago

Yes they can!

There are many different ways it's done but one I find the coolest is a signaling light hooked into the siren of an emergency vehicle. Traffic lights can look for this signal from vehicles and, upon seeing it, heavily prioritize letting the lane it's in have a green.