Okay, when I said that googling turned up squat, it turns out that my google kung-fu simply was not good enough.
I found this site, created by a guy with a desultory interest in utility poles:
The Unofficial Utility Pole Page In his links section, I found link to a company called Almetek, which makes stuff similar to Premax. On Almetek's site, I found this:
Almetek reflective grids Scroll down inside the frame on the page that comes up.
So they are reflective after all! I suppose if I had noticed that to begin with, it would have been a no-brainer....
Jim
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Speaking from a secure undisclosed location.