BAM Nuttall has been awarded a £10m construction contract to strengthen the M8 White Cart Viaduct in Paisley, Glasgow.
The 12-month contract includes strengthening, maintenance and refurbishment works on the current bridge, with work set to start this summer.
The 30-year-old bridge is used by over 80,000 vehicles daily.
The works, which will strengthen girders, replace the eastbound carriageway expansion joints, install new lighting and improve drainage, will mainly take place inside and underneath the bridge.
When finished, the 40mph speed limit, which was established with the narrow lanes in 2007 to reduce the effects of extra weight on the bridge, will also be lifted and the original lane markings reinstated over the viaduct.
A Transport Scotland statement said: “These works to strengthen the viaduct complete a detailed programme of assessment and investigation of the supporting steel superstructure. The design will extend the life of the viaduct to support traffic for the foreseeable future and enable the work to be carried out whilst the viaduct remains in service for traffic.”