Traffic will be diverted over the Forth Road Bridge to enable jobs, including updating and testing software for the automated barriers, an inspection of the expansion joints on the southbound carriageway and other routine tasks, to be done.
The work will be done overnight on Thursday and Friday.
The new barriers are used to divert traffic onto the Forth Road Bridge, should the Queensferry Crossing have to close for any reason.
The new automated barriers system on the Queensferry Crossing. (Image: Newsquest) READ MORE: Ice hitting cars on Queensferry Crossing ‘is not falling from cables’
David Bishop, BEAR Scotland’s south east unit bridges manager, said: “The Queensferry Crossing automated barriers require routine software updates to ensure the control units operate as required.
“A recent review of the system’s programming identified that an update, followed by trial deployments of the barriers, is required to ensure the barriers continue to function properly.
“We need to close the carriageway during these trial deployments to ensure the safety of road users and the workforce, however we’ve scheduled the work between 11pm and 4am to minimise any disruption.
“We’ll be making full use of the closures to carry out other maintenance and inspection tasks. This will reduce the need for further closures in future.”
READ MORE: New system diverts traffic quicker over Queensferry Crossing
From 11pm on Thursday January 16 until 4am the following morning, the M90 will be closed in both directions at junction 1B Ferrytoll.
Southbound traffic will be diverted off the motorway at Ferrytoll, across the Forth Road Bridge and along the A904 Builyeon Road to rejoin the M90 at junction 1A Queensferry.
Northbound traffic will be diverted off the motorway at Ferrytoll then immediately back on again via the northbound on-slip.
From 11pm on Friday January 17 until 4am the following morning, the M90 will be closed in both directions between the Scotstoun and Queensferry junctions.
Southbound traffic will be diverted from junction 1A Queensferry via the A904 to Echline junction, then via the southbound public transport link and the A90 into Edinburgh, Maybury Road and Glasgow Road to M9 junction 1 Newbridge.
Traffic joining the M90 northbound from the A90 will be diverted up the northbound public transport link then onto the B800 towards Echline junction, the A904 and Queensferry junction.
Traffic wishing to join the M90 northbound from the M9 eastbound will be diverted off at M9 junction 2, onto the B8046 and then the A904 to M90 junction 1A Queensferry.
READ MORE: ‘We can’t fix’ problem of ice falling from the Queensferry Crossing
Traffic wishing to join the M90 northbound from the M9 westbound will be diverted on to M9 junction 3, and then back eastbound to exit at M9 junction 2, onto the B8046 and then the A904 to M90 junction 1A Queensferry.
The M9 Junction 1B Winchburgh eastbound on-slip will be closed, with traffic diverted from M9 Junction 3.
Motorists are encouraged to plan ahead by checking the Traffic Scotland website www.traffic.gov.scot for up-to-date travel information and allowing extra time for their journey.