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You might want to check your usage of "signage." In this case, "sign" would be appropriate, as it is a single sign. Signage refers to a series of signs, all relating to the same thing. An example would be a series of Detour signs directing you around a work area, they would be detour signage.
There were at least 3 signs by my count, making signage the appropriate term.
A sign "series" not 3 of the same sign. Another example: Casino in 10 miles, Casino in 5 miles, Casino ahead.
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