This is another one of those places where current maps tell you 66 is one road, when it’s deathly obvious that it’s not. As your driving along on a modern concrete highway bridge, off to the left there’s an antique metal one with a massive Route 66 sign on it.
I double backed to learn it was two lane bridge, brick paved bridge connected to what was the ORIGINAL route 66 in this area, i.e., the Ozark Trail .
…and the road that I took to get here is a deviation from that route… which can clearly be seen going off into the distance from the bridge (and cutting the 2nd leg of a sort of V from the road current maps tell me is 66).

When I got close to the bridge I found these guys their social media folks who have a blog page for the dogs and their dogs travel Route 66. When I doubled back to the other side I found the same couple with their dogs also trying to get onto the actual 66
These guys apparently travel all over take photos of their pups lined up in a row, and then sell them to people. I ran into them finishing off their Route 66 collection… they told me they don’t do it as one big trip, they do it section by section as fits their schedules.