I would bet that the green signs are the newer ones and have "mixed case" lettering, and the white signs with black letters are all upper-case, and are the older signs. Municipalities were given some latitude and are not required to replace the older signs but all new street signs must adhere to the Recent Federal standards. I think Janet Tutt mentioned this at a POA meeting several years ago. At that time I was surprised that the Feds would care about local street signs.
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