A fatal crash on the A413 near Wendover which left two men dead has been referred by police to the Independent Police Complaints Commission (IPCC) after allegations officers could have done more to prevent the tragedy.
Malcolm Tindall, 64, of Aylesbury and Carl Bird, 29, of High Wycombe died when the vehicles they were travelling in crashed at 6am on March 4.
A woman travelling with Mr Bird also suffered serious injuries.
Just 75 minutes earlier police had been called to the same stretch of road after Martin Kendall, from Aylesbury, skidded into a ditch in his VW Passat.
He says that his car skidded on a 20ft sheet of ice that stretched across the road, and criticised police for not warning other road users about the ice.
The IPCC referral made by Thames Valley Police is in relation to the actions of the officers who attended the first collision on the road.