[WhoDat]

Originally Posted by gryoung

I believe street sign standards (reflectivity and mixed case lettering) are covered by a Federal Agency. This document may answer your question.

https://www.fas.org/sgp/crs/misc/R43042.pdf

If true, I think it is ridicules that the federal government is involved in telling local communities what color their street signs should be. Another case of overreach.