Suzanne Singer, 40, from Shoeburyness in Essex, died after swerving off the A127 near Basildon and hitting a tree.
Two drivers have told Essex Police objects hit their vehicles at about the same time as the woman's Vauxhall Corsa left the A127 at Dunton.
A post-mortem examination found she died of multiple injuries. Police have carried out a search of the scene.
One of the drivers who contacted police said his driver-side window was smashed a few minutes before the woman crashed into trees beside the road.
The south-bound carriageway of the road was closed for more than five hours as a result.
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