During four nights workers will be testing the new removable barrier by installing and removing it, it has been revealed.
The M20 will close in both directions overnight between junctions seven and nine coastbound, and junctions nine and eight London-bound, on Friday December 11, for the installation of a moveable barrier.
The Government website revealed: ‘When the M20 reopens by 8am on Saturday 12 December, the contraflow will be in place in its initial phase.
‘Drivers will need to follow the different layout on the M20 from just north of Junction 8 (for Hollingbourne/Leeds) to Junction 9 (Ashford).
‘Lorries heading for mainland Europe will be routed down the coastbound carriageway, with a 30mph speed limit in place.
‘All other traffic will be directed onto the contraflow, with two lanes in each direction operating at 50mph.’
At 8pm on Saturday, December 12, the M20 will close in both directions overnight between junctions seven and nine coastbound and junctions nine and eight London-bound.
They will reopen by 8am on Sunday, December 13, with the contraflow open in its final phase.
On the night of Sunday, December 12, the road will close between the same junctions and times so traffic management can be removed.
The Government guidance reads: ‘When the M20 reopens by 8am on Monday 14 December, the coastbound carriageway will be back to normal, with all traffic management removed.
‘The London-bound carriageway will be open but some traffic management – including the moveable barrier – will still be in place.
‘Speed restrictions will apply. The London-bound carriageway will be closed overnight between junctions 9 and 8 at 8pm on Monday 14 December with the moveable barrier being moved to the far side of the hard shoulder.’
By 8am on Tuesday, December 15, the M20 should be back to normal with all three lanes at the national speed limit.