A seven month programme of suspension cable inspections is to start on the M48 Severn Bridge next week.
The job will see a westbound lane closure from Monday until the beginning of September and an eastbound lane closure from mid-May until mid-October.
Highways England project manager Chris Pope said: “To carry out these cable inspections and to ensure the safety of both the travelling public and our workforce, it will be necessary to put these long-term lane closures in place.
“The inspections are vital to allow us to understand the current condition of the suspension cables and confirm that the measures that we implemented over the last 10 years have been effective in ensuring the long-term viability of the bridge and the safety of its users.”
During the period of lane closures, vehicles over 2.9m wide will be prohibited from using the bridge. It will also be closed totally over four weekends to enable the lifting of an inspection gantry to a high level on the suspension cable.