18 March 2015

A remedial scheme to replace the waterproofing, joints and surfacing and undertake repairs to the bridge decks on the M8 Junction 4 have been substantially completed ahead of schedule. Overnight maintenance work to install movement joints on the bridge decks will continue to take place until 26th March, but the daytime contraflow system was completely removed on 17th March 2015.

The programme of work, which commenced on 20th February, remains on course to be fully completed ahead of time.

The bridge improvement programme represents an investment of £750,000 by Transport Scotland in ensuring the long term integrity of the bridges, enhancing the durability, reducing future maintenance requirements and creating improved road surface conditions on one of Scotland’s most economically vital motorways.

The work involved removal of the road surfacing to expose the topside of the bridge decks, concrete repairs to areas of damage found during this exposure, application of a waterproofing layer, resurfacing, relining and installation of new joints. 

Work was undertaken in two phases; phase one to the Westbound side and phase two to the Eastbound side. Each phase of the work required complete closure of the M8 over the relevant decks and, in order to maintain two lanes of traffic in each direction on the M8, the use of innovative Traffic Management was employed.  This entailed the use of a single lane contraflow with simultaneous single lane diversion through the Junction 4 roundabout using the on/off slip roads.  Maintaining two lanes in each direction, including use of hard shoulder running, ensured delays were kept to a minimum.

The short diversion of one lane around the Junction 4 roundabout was implemented with the support and co-operation of West Lothian Council.

Installation of new movement (expansion) joints on the bridge decks is being undertaken during subsequent overnight carriageway closures to ensure minimum disruption to the travelling public. This will entail shutting Eastbound and Westbound sides on separate nights and diverting traffic using through the Junction 4 roundabout using the on/off slip roads.

Keith McKune, Operating Company Representative with Amey, who undertook the work on behalf of Transport Scotland, said: “We appreciate the patience and co-operation of road users while this essential work has been undertaken. Road maintenance work intended to keep these important routes operating safely and effectively can lead to disruption, but our intention is always to restore an improved service, as swiftly and efficiently as possible. I am delighted that we have been able to complete these works two weeks ahead of schedule”

This essential work is part of Transport Scotland’s commitment to provide road users with greater journey time reliability, improved safety and comfort across all of Scotland’s vital Trunk Road Networks.

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