A1 Southbound closed because of accident between A6136 Leeming Lane (Catterick South) to A684 (Leeming Bar).
Road closed from Catterick Airfield to Killerby Hall, after vehicle aquaplaned and overturned. It's expected to be closed until at least 10:30am.
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Sandiford, a former legal secretary originally from Redcar, was convicted of drug smuggling offences and sentenced to death in 2013.
Durham Crown Court heard that one of the male victims suffered a triple-fractured jaw, while left lying in the gutter, unconscious.