Strengthening check for Tame Valley Viaduct
Part of Birmingham's 40-year-old motorway network is to undergo a £2.6m safety assessment.
Engineers are to check the Tame Valley Viaduct, which carries 100,000 vehicles a day using the elevated section of the A38 (M) Aston Expressway.
Birmingham City Council said the viaduct was currently safe but it would check what longer term strengthening was needed.
The assessment is expected to run until 2013/14, the council said.
Councillor Timothy Huxtable, cabinet member for transport, environment and regeneration, said: "First of all I would like to stress that the viaduct is perfectly safe and secure both now and for some time into the future, and that this work is really about ensuring the road remains viable for generations more to come.
"Since 1972 the A38 (M) has been a vital spoke in the city's transport infrastructure and it would be totally irresponsible for us not to act before it is too late to ensure it can remain so for many more years."
The plan was approved by the council on Tuesday.