Work to fill a 15ft hole in the M2 will be complete by Thursday, the Highways Agency has said.
The hole, which appeared between junctions 5 and 6 near Lydgate in Kent, is thought to be a dene hole which is very old a type of chalk mine. Some dene holes are prehistoric.
The hole has already been filled with 40 tonnes of pea shingle and resurfacing work began yesterday night and will continue tonight. All lanes of the motorway will reopen on Thursday morning and the temporary 40mph speed limit will be lifted. The Highways Agency also carried out additional maintenance, such as pothole resurfacing and clearance of vegetation on the hard shoulder, while the road was closed.
The hole was filled in when the motorway was built but the Highways Agency said wet weather had contributed to the destabilisation of the ground causing the hole to appear. The agency said geotechnical investigations had confirmed that the ground beneath the M2 is safe for traffic to use.
Simon Duke, Highways Agency asset delivery manager for Kent said: “I would like to thank drivers for their patience and cooperation throughout the work to stabilise the hole that appeared on the M2 near Lynsted gate in Kent last Tuesday. Our investigations are complete and the hole has been stabilised, meaning that traffic can safely use all lanes of the M2.”
The Highways Agency has also carried out repairs to flooded roads including drainage clearance on the A20 balancing pond near Pinks Hill and floodwater clearance on the A27 near Lancing.