This thread never ceases to entertain and inform.
Based on the discussion above, I have good news and bad news:
https://en.wikipedia.org/wiki/...arking#United_States
According to the article, the good news is that yellow center lines were first used in Oregon in 1917. The bad news is that between 1954 and 1958 white lines became the standard for center lines in the U.S. There apparently was a transition between then and 1971 when the yellow center line became a codified standard.
I am so enamored of Art's layout that I and I'm sure most others are going to give him a pass under the general heading of "poetic license".
Richie C., thanks for pointing it out. Any observation presented as politely as yours that causes us all to discuss and learn is always welcome.
Steven J. Serenska