Five haunting questions behind Formula One’s greatest riddle – what caused Ayrton Senna’s fatal crash 30 years ago?

HEADING into a curve that the Formula One genius Ayrton Senna knew very well at the San Marino Grand Prix, there was no sign it would be the Brazilian’s final moment.

But rather than his blue Williams racing car turning into the Tamburello left corner, it sped at 190mph straight into a concrete barrier.

GettyAyrton Senna’s fatal crash 30 years ago[/caption] The Brazilian was a three-time Formula One world championAP:Associated Press AFPSenna’s girlfriend Adriana Galisteu...