The road at Latteridge Hill between Earthcott Green and Latteridge has been closed to repair a landslip.
South Gloucestershire Council says the work is likely to last for six weeks.
Remedial measures were taken following initial landslips, believed to be caused by a natural spring located under the bank, however, a geological survey revealed that the structure was still susceptible to further slippage. After exploring all possible options, the only solution was to close Latteridge Road to build a retaining structure to hold back the bank.
These essential works have been carefully planned to be completed as quickly as possible in order to minimise disruption to residents and local businesses. When the works start, access will be carefully monitored and extensive signage will be put up in advance to outline the alternative routes. Access will be maintained for residents only.
Cllr Brian Allinson, executive member for planning, transportation and strategic environment, said: “These works were deferred from earlier in the summer after the council listened to local residents and farmers who told us that the collection of the harvest would be adversely affected.
“The closure will fully repair the landslip and will remove the need for the current set of temporary traffic lights. I would like to apologise in advance for any inconvenience these repairs may cause to residents and drivers and thank them for their patience and understanding while these essential safety works are carried out.”
During this time the following diversion will be in place:
From the B4427 Church Road, A38 Gloucester Road (S), A4174 Avon Ring Road,
A432 Badminton Road, B4059 Stover Road, B4059 Yate Road, B4059 Bristol Road,
B4059 Latteridge Hill (part unaffected) and vice-versa.
From the B4427 Church Road, A38 Gloucester Road (N), B4509, B4058, B4059 Bristol Road, B4059 Latteridge Hill (part unaffected) and vice-versa.
Source: South Gloucestershire Council