This is another one of those typos that is probably totally easy to explain, but points to a frustrating lack of proofreading.

I’m sure that the original typist entered “tagged/towed,” and then noticed the text was aligning improperly and modified it — partially.  And so we end up with a “Paris in the the spring” situation that Kacia L. says she didn’t even notice on any of the “countless” times she’s walked past this sign.  The brain is a funny thing!