The correct generic name for such items is "roadstuds".
The inventor (Percy Shaw) called his company "Reflecting Roadstuds Ltd"
and adopted the word "Catseyes" as a registered trademark for HIS
roadstud design. Therefore, whilst "Catseyes" is a legitimate term, it
may only be applied to the products of Reflective Roadstuds Ltd, and not
to any other manufacturer's products, hence the precise adherence of
councils to trade names.
It's a bit like using the word (another registered trademark) "Coke"
only to refer to the products of The Coca-Cola Company and referring to
other makers' products simply as "cola".
I'd have thought this was well known.
<
http://www.percyshawcatseyes.com/>