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Seriously, though, I don't know how realistic it would be to use e-ink on highways on anything but regularly-changing signs. And with highway regulations (I've contracted with the FHWA for years), there would have to be a way to visually identify that sign as one that can change, as an advanced warning... and possibly additional non-changing warning signs before you read the changing sign. That's the way changeable speed limit signs are done around school zones, for example.
No one would be allowed by the FHWA to make a speed limit sign that looked exactly like a standard sign. If anyone did, and the public found out, politicians would be looking for new jobs (or safe houses).
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