Traffic will be diverted over the Forth Road Bridge during a partial overnight closure of the Queensferry Crossing this weekend.
From 10pm on Saturday to 6am on Sunday engineers will calibrate vital safety equipment on the crossing, which will require carriageway closures.
The northbound carriageway will be closed first, at 10pm, and will reopen at 2am. The southbound carriageway will close at 2am and reopen when the works are complete at 6am.
Traffic management will be in place, which will see traffic headed for the affected carriageway diverted over the Forth Road Bridge.
Transport Scotland said it was necessary to completely close one carriageway at a time to allow engineers from Forth Crossing Bridge Constructors (FCBC) to calibrate structural health monitoring sensors, vital for detecting any potential structural weaknesses in the bridge.
The calibration test will see FCBC assess truck loads crossing the carriageways as part of its final activities on site.
A Transport Scotland spokesperson explained: “This test will see a number trucks of known weight driven over the Queensferry Crossing in both directions. Data recorded by the sensors from this exercise will allow us to implement final calibrations to this equipment where necessary.
“In order for this testing to be carried out we’ll have to restrict traffic on one carriageway at a time.
“Discussions between Transport Scotland, FCBC and the Trunk Road Operating Company have concluded that the simplest option with least disruption to road users is to use the Forth Road Bridge as a diversion route.
“As this work is being undertaken over a single night, we don’t anticipate that it will cause any congestion problems.”
