Quote:
Originally Posted by ColdNoMore
...Only if it is a destination, like would be seen on an Interstate/Freeway/Turnpike. 
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Nope. From the MUTCD...
"Q: Can lettering on Street Name signs still be displayed in all upper-case letters?
A: No, lettering for place names and destinations on all guide signs, including Street Name signs, shall be in mixed-case lettering with the first letter in upper-case followed by lower-case letters."