Editing M1 motorway (section)

==== M1 widening and variable speed limits, junctions 6A to 10 (M25 to Luton South) ====
Work began on the {{convert|10|mi|km|adj=on}} section between the [[M25 motorway|M25]] and Luton (J6A-J10) in 2006 and opened in 2009, which included the construction of new parallel [[Local–express lanes|collector-distributor lanes]] between junctions 7 and 8.

The [[M10 motorway (Great Britain)|M10]] spur was built as a motorway because it inevitably led to the M1, but as non-motorway traffic could now travel between the A414 at Hemel Hempstead and Park Street Roundabout without having to access the M1, the M10 was downgraded to an [[Great Britain road numbering scheme|A road]], and designated as part of the [[A414 road|A414]] to allow for this. The work also included widening or replacement of 11 underbridges on one or both carriageways, and replacing seven overbridges<ref>{{cite web|title=M1 Jct 6a to 10 Widening|url=http://www.highways.gov.uk/roads/projects/4478.aspx|url-status=dead|archive-url=https://web.archive.org/web/20090916021803/http://www.highways.gov.uk/roads/projects/4478.aspx|archive-date=16 September 2009|publisher=Highways Agency}}</ref> at a total cost of £294&nbsp;million.<ref>{{cite web|title=9 Mar 2009 : Column 10W—continued|url=https://publications.parliament.uk/pa/cm200809/cmhansrd/cm090309/text/90309w0003.htm|work=Hansard}}</ref> A [[Smart motorway|variable mandatory speed limit]] system was installed, making this the first [[smart motorway]] scheme on the M1.