The Interlink M74 joint venture, which comprises Balfour Beatty, Sir Robert McAlpine, Morgan Est and Morrison, is building 13 bridges on the route in and around Glasgow including the Eglinton Viaduct.
But work has been stopped until assurances are given that work on the viaduct will not damage the underground train network.
A crack was found on the wall of a subway tunnel on the city’s South Side, 25 yards from the site where excavations were being dug for the motorway.
The crack is said to have caused plaster to fall from the roof of a tunnel between West Street and Bridge Street in Glasgow and led to the temporary suspension of services on the network.
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The city’s subway operator, Strathclyde Partnership for Transport, told the Evening Times: “We have a duty to ensure the subway operates in a fashion that guarantees passenger safety. We are in discussions about bringing in a more sophisticated monitoring system in our tunnels so problems can be identified at an earlier stage.”
A spokeswoman for the consortium said: “Recommencing the work will depend on the outcome of the SPT investigation.”
The entire 8 km long link is due to be finished in 2011.
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