Kent County Council has confirmed that work has started on compaction grouting to stabilise the A26 in Maidstone following a ground collapse at the end of May.
Investigations revealed that the “sinkhole” in Tonbridge Road was 20m long, 12m wide and up to 3m deep in places but the cause has not yet been determined.
The council has said that ground investigation is continuing in order to fully determine the scale and cause of the problem.
Keller is undertaking the remedial work and the first stage is focused on stabilising the ground surrounding properties before work moves to the main carriageway.
“Public and road user safety remains our highest priority and it is important that we take every care at all times,” said Kent County Council cabinet member for planning, highways, transport and waste Mike Whiting.
“Our aim is to complete the works by the end of the school holidays and the highways team is working closely with the utility company to get the road open as soon as possible.
“Although work is not always visible at Tonbridge Road, I understand that this perceived lack of progress has caused some frustration.
“I can assure you that there is a lot of activity going on behind the scenes which includes planning and design work to make sure the repair is carried out safely, quickly and in the right way.
“I apologise for the continued disruption caused by the sinkhole and I would like to thank the residents and commuters for their patience during these works.”