Upgrade of the M20 between junction 3 (M26) and junction 5 (the A20 west of Maidstone) to Smart Motorway standard. This section of the M20 has three lanes in each direction and is particularly busy, running between the M26 and Maidstone. West of this section, traffic disperses between the M20 and M26; east of this section the motorway was widened in the 1990s and already operates with variable speed limits.
The work will include conversion of the hard shoulder into a permanent fourth running lane, construction of new emergency areas, and installation of electronic message signs and surveillance equipment. Teapot Lane footbridge will be replaced as part of the works because it does not presently provide enough clearance for the hard shoulder to be used as a live lane.
This scheme is part of the Smart Motorways programme of works.
The Highways England website now says main construction is underway as of May 2018.
They have successfully built a compound on the A228 just north of junction 4. It might be deja vous but I am sure thats the exact spot that was a compound for widening the southbound bridge and they returned it to a field about 6 months ago.....
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WIth thanks to Tom Kitcher for information on this page.