More on the mystery of the Route 66 motor court/gas station/bar-and-grill detailed below and here.
In the fourth photo, one can see a painted sign or ad that I guessed read "Colony" -- but Colony what? Colony Motor Courts? Cigars? Beer?
Flo gave the photo a look and ascertained that it doesn't read "Colony" at all, but "Colonial." You can even see a damsel in 18th century attire curtsying in the oval just above the lettering.
I phoned my dad and asked him if the name Colonial Motor Courts (or Motor Inn or Tourist Courts or...) rang a bell, and he said no.
"But," he offered, "there used to be a brand of bread in Oklahoma City called Colonial Bread. Maybe that's what the ad was touting."
And sure enough, I found some images that suggest he might be right.
Here's a blow-up of the Colonial ad from the aforementioned photo:

And here's a cardboard display ad for Colonial Bread that dates, I believe, from the 1930s:


As you can see, the font is the same, especially the G where "good bread" would be, which even has that dash on the upper circle (I learned from Flo that it's called an "ear") -- you can just make it out through the bushes.
So I'm now reasonably convinced it's an ad for Colonial Bread (though I've yet to find an image that includes the curtsying damsel).
America has finally awakened from an eight-year nightmare, hopefully not too much worse for the wear.
We saw Campbell Scott with a female companion at the Chelsea Cinema tonight. They came in at the last minute for the 9:45 showing of The Wrestler and were forced to sit in the first or second row.
They remained, as did Flo and I, through the end of the credits.