The railway bridge in Gipsy Patch Lane will be replaced this autumn when the route will be closed for almost two weeks.
Motorists have been warned to expect an 'extended period of disruption' while the major works are completed.
The bridge replacement - which began last year - is part of the Cribbs Patchway metrobus extension (CPME) scheme, which will provide a direct bus link between Bristol Parkway and The Mall.
Network Rail postponed the work during the coronavirus pandemic due to concerns around social distancing.
But it's now been revealed the bridge move will take place between Saturday October 24 and the early hours of Saturday November 7, lasting approximately 13 days.
To enable the bridge replacement, the rail line will be closed to trains for a 'number of days'.
Cabinet Member for Transport Cllr Steve Reade said: "We have all watched the project progress over the last 12 months and this will be a positive step towards reaching our goal of completing such an important transport project for the area.
“CPME is a key part of our ambition to keep South Gloucestershire moving.
"It will bring with it many benefits including improved cycling and pedestrian facilities, a reduction in traffic and congestion, improved traffic flow on Gipsy Patch Lane and the provision of a high quality express bus service that will create a direct route between Bristol Parkway railway station, Stoke Gifford, the Cribbs Patchway New Neighbourhood and The Mall shopping centre.
He added: "We understand these new dates, particularly the length of closure for Gipsy Patch Lane, will bring with them an extended period of disruption.
"We sincerely apologise for this and would like to take this opportunity to thank the local community for their continued patience and understanding.”
Workers at Network Rail are also hoping to complete some of the tasks on the line that previously would have been carried out in separate follow up shifts.
