do they also specifically prohibit driving backwards down major highways at speeds exceeding 65 mph, whilst wearing a blindfold?

Yes LH, although neither the speed nor the blindfold appear to be required elements in the offence.

As a matter of fact, my own father was ticketed once in Oklahoma for just that offense. The forward gears went out in his "little Nash Rambler" and he was attempting to reach the nearest garage - in reverse, going in the proper direction but unfortunately pointing in the wrong direction on a one way street, and keeping up with traffic. He'd gone about 3 miles before being stopped.

The officer who stopped and ticketed him affirmed that he was not creating a hazard or interfering with traffic, but the ordinance prohibited "backing more than 50 feet" on any public street.

They called a tow truck for him, and forced him to use it for the remaining 3 blocks. (He almost made it!)

I believe I do still have the newspaper clipping, which apparently got nation-wide publication. (They were a little less plentifully supplied with news back then - ca. 1960 or so, I guess.)

John