Following on from this post http://lrassociation.blogspot.com/2010/08/highways-agency-m25-motorway-junctions.html the Highways Agency has updated the HA Website with this information.http://www.highways.gov.uk/roads/projects/23473.aspx.
: As part of the scheme, existing electronic lane control signing will be upgraded and replaced with more modern information signs and variable mandatory speed limit signs. Many of the existing gantries will be adapted to accommodate the new equipment and some new gantries installed to provide better visibility of the speed limits when they are displayed. This project will extend the current variable speed limit control operating between J10 and J16 and will be installed on both carriageways. When the scheme is finished, drivers will benefit from improved journey reliability, safer driving conditions and reduced driver stress. The system is also beneficial to the environment with recuced levels of vehicle emissions. Estimated completion is for the end of 2011.