Question:  How does an IISNS mounting work? 

Answer:  Internally Illuminated Street Name Signs are typically mounted under a traffic signal mast arm.  Older style signs are typically light be fluorescent tubes and new style signs are LED.  The mountings connect the sign housing to the mast arm, and are hinged so the sign can swing in the wind and reduce what would otherwise be a large wind load.  The photo shows a close up of an IISNS from Alameda County.

There is a base that connects...


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