PhilD wrote on 04 August 2012 13:38:28 ...
On Aug 4, 11:13 am, Walter Briscoe
wrote:
Variable mandatory speed limits, displayed on overhead ...

Aren't all existing motorway limits 'mandatory'? They are not, in
general, enforced particularly well.

PhilD

The limits with the number inside a red circle are mandatory. If the
number is shown accompanied by amber flashing lights and no circle, it's
an advisory limit.
--
Richard J.
(to email me, swap 'uk' and 'yon' in address)