In message , at 15:31:02 on Mon, 6 Sep
2004, Nick Finnigan remarked:
The regulations say a 'except cycles' is a permitted variant
http://www.hmso.gov.uk/si/si2002/023113ab.gif

But nothing on that page says "except cycles".

The table under 954.4 has item 4 with a permitted variant.

However, I now realize these round plates are mainly used on
traffic lights with banned turns, and 'No Entries', which usually
have rectangular plates underneath, might not be covered there.

Look at Item 3 of 954.4, and you'll see that it doesn't list 616 (which
is the "No Entry" sign).

Interstingly, 954.7 lists as variants:

Except local buses and cycles and
Except local buses and taxis

Now, as there is no such thing as a "local cycle", we must conclude that
the latter refers to all taxis, and not just local ones. Which answers a
different question that's been asked from time to time.

--
Roland Perry