The bridge has suffered from water damage in recent years and the bridge deck now needs replacing to ensure this section of the M4 remains safe and reliable for many years to come.
The work starts on Monday, 20 July and will require a complete closure of the B4057, which runs under the bridge. Work will continue for six weeks.
Project sponsor Chris Pope said:
We spent a long time considering the best option for undertaking the work and this included considering carefully when the scheme would cause the least disruption.
Traffic flow data showed that the B4057 is far less busy during the school summer holidays and after close consultation with South Gloucestershire Council, who operate the road, we agreed July and August would be the best time to complete the work.
We have carefully analysed the impact on traffic and this shows that delays should be less than ten minutes but we would like to advise drivers to allow slightly extra time to complete their journeys.
The works are being undertaken on a scaffold platform which spans the width of the B4057 and the section underneath it needs to be closed for the safety of road users and our workers. However, access will remain open to pedestrians and cyclists.
A fully signed diversion will be in place throughout the works. Drivers will be directed follow the A4058 (Winterbourne High Street/Hill), then along the Bristol Road and on to the Old Gloucester Road to re-join the B4057 at Beacon lane. This diversion route will be the reverse direction for traffic travelling from Filton/Patchway towards Winterbourne.
Members of the public should contact the Highways England customer contact centre on 0300 123 5000.
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