Not double diamond - diverging diamond. I've watched three YouTubes on how they work, but what happens when the lane lines are covered with snow?
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Joe, thanks for the info and the link to archive.com   The art is indeed lovely.

I had cousins from rural Indiana, and their speech was noticeably different from that of my family. It would be fun to hear somebody with that accent recite 'Little Orphant Annie.' Even though the poem is about 120 years old, I suspect Riley laid the accent on with a trowel.