The signs were 11" X 41". I have a real one;.
At the time this house was in planning, I also had a little project in the back of my warped mind. It was a set of half scale Burma shave signs for my driveway, to be set in place for special occasions. They did get made, and used a few times. I used a genuine limerick for them, and they are cute. I have a picture somewhere with them in place. I'll try to find it.
The red I used was Chrysler Impact red from around 1960, as I recall. It was a good match for the real sign I have.
Inca-dentally, on the real sign, it was a last sign in the sequence, so the Burma Shave logo was on both sides. Of course, the lettering on all of he real signs had been silk screening. It turned out that he logo on one side of the sign I have was done with a different silk screen. When it was shot for silk screening my signs, I had to be careful which side was used. They are very different from each other.
There are several books, so it seems, that have a complete listing of the limericks by year. The backgrounds did indeed, vary from the original red. My memory of those signs is vivid, as I was growing up when they were on the roads. It's a wonderful memory. l