ENTIRE carriageways of the A1 will be closed overnight for four nights this week.
Amey, which is responsible for the upkeep of East Lothian's busiest road, is carrying out a road improvement scheme worth about £360,000, on both carriageways of the dual carriageway at Oaktree, near Haddington.
As a result, stretches of the road will have to be temporarily closed.
Improvement work on the eastbound A1 carriageway will take place from this evening (Wednesday) until Saturday, between 8pm and 6am each night.
The work on the westbound carriageway will then take place from 8pm on Sunday until 6am on Monday.
The work requires full closures of the eastbound and westbound carriageways respectively for the full extent of the works, with a signed diversion route in place for each scheme.
During the work on the eastbound carriageway, traffic will be directed to leave the A1 at the Gladsmuir eastbound off-slip road and will travel via the B6363, before taking the A199 to re-join the eastbound A1 at the Oaktree on-slip road.
Meanwhile, when work is being carried out on the westbound carriageway, traffic will be directed to leave the A1 at the Abbotsview westbound off-slip road. They will then travel via the A199 to re-join the westbound A1 at the Oaktree westbound on-slip road.
Amey says the work has been planned in consultation with Transport Scotland, Traffic Scotland, the emergency services, local bus operating companies and East Lothian Council.