Duke of Edinburgh crash: Why do royals insist on driving?

Prince Philip's Range Rover lies on its side following the crash near Sandringham.

London (CNN)There's one question gripping the UK today and for once, it's not about Brexit.

Why is Prince Philip still driving at the age of 97, especially when he has access to a fleet of royal chauffeurs?
Remarkably, the Duke of Edinburgh managed to walk away from the crash unscathed. The prince was "obviously shaken," an eyewitness told the BBC, but he was able to stand and showed concern for the occupants of the other car. The female driver of the other vehicle and her passenger suffered minor injuries, and there was also a baby in that car who wasn't hurt.
    Prince Philip once surprised US President Barack Obama and first lady Michelle Obama by picking them up from their helicopter in Windsor in April 2016.
    It's unlike Philip to obsess about media coverage of his life but if he does tune in, he will probably feel a mixture of bafflement and despair about the focus on him after this crash.
    The Duke of Edinburgh sits in his Land Rover at the Royal Windsor Horse Show in May 2015.