Squares are more boring than circles, and can be mistaken for anything.
This marker would be unmistakable as a highway marker for the Bay state. A state name should be added, like on this shield. I used the italic version of Arrus BT font for a modern classic feel. The color is supposed to be a deep cranberry-like purple red which will stand out among the New England states. Paul Schlichtman sent in this shield featuring a minuteman and dark red numbers.