A 10-mile section of a busy motorway remains closed after the discovery on Tuesday of a 15ft-deep hole in the central reservation.
The M2 in Kent is shut in both directions between junction 5 near Sittingbourne and junction 6 to the south of Faversham.
The hole covers an area measuring 16 feet by six feet. A spokeswoman for the Highways Agency said the motorway has been shut to enable urgent safety checks to be carried out.
The spokeswoman said drivers heading to and from the port of Dover should use the M20 instead. Using ajourney planner can help motorists when diversions and road closures force them to use unfamiliar routes.
Professor Stephen Glaister, director of the RAC foundation, said: "We already have the most congested road network in Europe and our motorways carry a third of all traffic. This will have a major impact on a main route in and out of the country.
"The surprise is that something on this scale hasn't happened before yet everyday our highways are literally being undermined by the rain.
"When the deluge finally stops we will be left with a huge repair bill on roads across the country."
Copyright Press Association 2014