Us Warns Hidden Radios May Be Embedded in Solar-Powered Highway Infrastructure
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The US government warns that solar-powered highway infrastructure may contain hidden radios, sparking concerns about potential security risks, while commenters speculate about the likelihood of malicious intent.
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Rather than anything malicious I'm thinking it's probably just a common module made for signs that can be updated over-the-air, and that feature just isn't enabled in the US signs.