DETAILS have been released on the £2 million bridge maintenance project due to affect motorway drivers for the next two months.
The Highways Agency is advising drivers who use the M23 to allow extra time for journeys until the end of November.
Work started last Friday to replace key components on a bridge between junction 8 (the M25) and junction 9 (Gatwick).
The bridge carries the M23 over Coopers Hill Road and the Redhill to Tonbridge railway line. Until this Saturday there will be one lane closed on each side of the motorway between the two junctions between 8pm and 6am.
From Saturday a contraflow system will be in place 24 hours a day, to allow two lanes to remain open in each direction.
Weather permitting, all the work is due to be finished by the end of November.
Highways Agency asset manager Peter Phillips said: "We are maintaining the bridge to prolong the life of the structure."
From Saturday a contraflow will be in place on the southbound carriageway.
A 40mph speed limit will be in operation in both directions.
The contraflow will then be switched onto the London-bound carriageway from October 13.
The contraflow will be removed on November 3 and the central reservation barrier replaced.
At this time the outside lane will be closed in both directions until all work is complete.
During this work traffic will use the hard shoulders to keep three lanes open in each direction and a 50 mph speed limit will be in place thoughout this section of road.