Thames Valley Police are re-investigating the deaths of eight people dating back to the 1970s.
Cold case detectives say the deaths - which occured in Berkshire, Oxfordshire, and Buckinghamshire - are unrelated.
The operation, named Nightingale, has been established as police have previously been unable to identify the bodies in each case.
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Icy patches remain on unsalted roads and police warn drivers they face on the spot fines if they don't clear snow from their cars.
Holly has the latest forecast for the east of the region.
Holly has the latest weather forecast for the west of the region.