In this file picture taken on May 1, 1994 Brazilian F1 driver Ayrton Senna adjusts his rear view mirror in the pits before the start of the San Marino Grand Prix in Imola, Italy. He was killed in an accident during the race. (Photo: AFP)

PARIS: The death of Ayrton Senna 25 years ago changed Formula One's attitude to safety to such an extent that only one driver, Jules Bianchi in 2014, has since suffered a fatal accident.