Where's The Banfield?

I challenge ANYONE in the Portland area, or anywhere for that matter, to show me a single sign, billboard, posted placard, or any other type of informational sign anywhere that refers to Interstate 84 through Portland, Oregon as "The Banfield."  (Spoiler alert: don't bother trying: you will be wasting your time).
Nonetheless, whenever any Portland radio station refers to I-84 in the context of a traffic report, they invariably refer to it as "The Banfield" (see my rant entitled "OPB Traffic Reports").