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Stop Signs Projected onto Water Curtains

Many tunnels in Sydney, Australia aren't tall enough to permit tractor trailers to move through safely. This animated gif shows a warning system that informs truck drivers when they're about to crash into a tunnel entrance. When sensors detect a vehicle that is too tall, the system pours water across the entrance to the tunnel and projects a stop sign onto that water curtain.

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The malicious uses for that if it were hacked would be devastating. It could easily play video. Imagine driving into an enclosed space like that with nothing in front of you and all of a sudden an 18 wheeler going the wrong way starts rocketing toward you--you've got a split second to react...
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