At least one lane of the southbound carriageway of the M1 in north London could reopen by the afternoon.
The Highways Agency said engineers at the Mill Hill site were hopeful a lane could be opened at 1600 BST.
The motorway has been closed southbound between junctions 1 and 4 since a fire started in a scrapyard beneath the motorway on Friday.
Steel pillars have been put up beneath a bridge which was badly damaged when the fire caused concrete to explode.
Engineers said it was a "miracle" the bridge had not collapsed because of the extent of fire damage.
Posted: Mon Apr 18, 2011 1:27 pm