Lorries can now use the Forth Road Bridge for six and a half hours every night after successful trials.
Heavy goods vehicle are able to use the troubled crossing from 11pm until 5:30am while strengthening work continues.
NCE reported earlier this month that the bridge was expected to be fully reopened in mid-March when the second phase of strengthening work was completed.
Amey engineers are working to attach a steel bracket to the south face of the north east main tower leg, from which the top of the deck truss will be supported via steel strand jacks.
This follows the first phase of repairs in December when steel splints were welded onto the truss end links.
The bridge was closed for a period before Christmas after a defect was found to a steel component beneath the southbound carriageway.
Transport minister Derek Mackay said this week: “Work to restore the bridge to its full capacity is continuing at pace and this is another step towards that goal.
“The HGV trial has been running for more than a week now and our careful monitoring shows that we can now allow more vehicles across the bridge.
“It means that more than 90% of traffic has access to the bridge while the strengthening work is carried-out by our expert team. All indications are that we are on track for the full re-opening soon and we will continue to explore options to allow as many HGVs as possible to use the crossing in the meantime.”
Amey account director for the Forth Road Bridge Mark Arndt said: “The HGV trial has gone better than we expected, with many drivers taking advantage of the overnight relaxation on a daily basis. We hope that more will benefit from the extended hours.
“We appreciate that the restrictions are frustrating but they are necessary. Our teams continue to work night and day to complete repair works and get the bridge re-opened as quickly as we can.”