Walter Briscoe wrote on 04 August 2012
11:13:21 ...
I've just found http://www.highways.gov.uk/news/pressrelease.aspx?press
releaseid=425156

Construction of an M25 managed motorway scheme for junctions 5
(Sevenoaks) and 7 (M23) is proposed to start in 2013/14.

The press release says it will be the "first M25 'managed motorway'".
I don't know why the scheme between M3 & M4 does not qualify already.

The term "managed motorway" means that the hard shoulder is available as
a traffic lane. The variable limit schemes on the M25 don't currently
include that.

"The hard shoulder will be converted to a traffic lane to add extra
capacity. Variable mandatory speed limits, displayed on overhead and
verge-mounted signs will help smooth the flow of traffic and reduce
congestion on this busy section of motorway."

The M25 often seizes in the AM peak between J5 & Clacket Lane Services.

--
Richard J.
(to email me, swap 'uk' and 'yon' in address)