Connect Plus, a joint venture of Balfour Beatty, Skanska, Atkins and Egis, was awarded a contract worth up to £321m to upgrade two sections of the London orbital last month. Cones began to appear on the Kent-Surrey stretch between junctions 5 and 7 almost immediately.
Work on the north side between junctions 23, where the M25 meets the A1(M), and junction 27, for the M11, will start later this month. Cones will start to appear there tonight. There will be speed restrictions until spring 2014.
The managed motorway scheme will use technology and overhead gantries to make the hard shoulder permanently available to traffic.
Advance work began in January, and from later this month main construction work will begin in the verges between junctions 23 and 25.
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