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But what are the requirements on the display? Can you get away with one LED for a single pixel? That'd really let you cheap out on the camera too.



No, the regulations do not specify technical specifications, they specify requirements in terms of actual visibility.

49 CFR 571.111 S14. specifies a test that the image must pass, and that would not pass:

https://www.ecfr.gov/current/title-49/part-571/section-571.1....)




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