The higher Blandford to Shaftesbury road remains closed after a landslip – and repair work could take several months to complete.
The C13 through Melbury Abbas at Dinah’s Hollow was shut following an inspection by Dorset County Council engineers yesterday.
A diversion is in place via the A350, while council officers were monitor the effects of extra traffic on the road.
Mike Harries, Dorset County Council’s director of environment and economic development said: “We appreciate the diversion is a long route and apologise for the inconvenience, but we have to protect the safety of drivers and other road users.
“A report on the slopes was carried out in December, but due to the extreme weather inspection teams have only just been able to return to normal duties.”