The Morning News https://ift.tt/3seKC4E
A pretty remarkable stop sign, as reported by Futility Closet:
When a truck ignores repeated alerts that it’s too tall to enter the Sydney Harbour Tunnel, an automated system projects a giant stop sign onto a curtain of water at the tunnel entrance. This presents the boldest possible message without causing damage to a heedless truck—and authorized vehicles can still pass safely through the curtain.
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