SPB my parents many many years ago had exactly this happen to them, and in the same area. My father was an exemplary driver with a spotless history. Two cars were heading straight for him head-on and he had nowhere to go. He had to swerve off into a ditch, and the resulting crash was very serious. The overtaker disappeared over the horizon. My mother was hurt very badly and was rushed to Pilgrim Hospital in Boston. She was unconscious for hours, turned black all over with the bruising, and had to stay in hospital for days. My father had a bad leg injury, treated in A&E. Their car was a complete write-off.
The Police took a statement, and said they were lucky to be alive.
Luckily there were witnesses in the cars behind, who stopped to call an ambulance etc. It was all horrifying.