Prince Philip, 97, was driving a Land Rover Freelander, which flipped on to the driver’s side after it was hit by another car when he pulled out of a driveway near the Queen’s Sandringham Estate in Norfolk.
The woman driving the other vehicle, a Kia, and her female passenger needed hospital treatment, while a witness said there was also a baby in the car.
Norfolk Police confirmed both drivers were breathalysed and the tests proved negative.
Witness Roy Warne, 75, told The Sun he saw the Land Rover crossing the A149 “like a somersault” and that he saw a crying baby in the Kia.
He overheard the Duke tell police he had been “dazzled by the sun”, according to the paper, although police would not confirm this detail Thursday night.
According to the AA, being dazzled by bright light is frequently cited as the cause of road accidents.
Figures released in 2014 showed the glare of a low-lying sun was contributing to an average of 28 road deaths a year.
Around 3,900 road users a year were injured during to incidents where the driver had been dazzled by the sun.