I drive by the sign everyday as I come to work off 395. It reminds me of back in the day when I was kid and a big ole horn would go off, so loud the entire town heard it.
I'm new to TC so I did some hunting on the law and here is what I found out...
Starting in 1987, people driving by Yakima on the Interstate began to notice a sign that read "Yakima-The Palm Springs of Washington." Over the years, depending upon who you talk to, it's become a topic of conversation, support, ridicule, and humor.