A sad day for F1 fans everywhere,but we should not forget that his was not the only death that weekend,Roland Ratzenberger also crashed & died during qualifying the previous day.
Ironically,on 1 May 1994, during the customary drivers' briefing, the remaining drivers agreed to the reformation of the Grand Prix Drivers' Association, with Senna, Gerhard Berger and Michael Schumacher as its first directors.
Ironic as it was also the day Senna died.
The Association subsequently pressed for improvements to car and circuit safety in the wake of Imola and other serious crashes during the 1994 season.
All in All the '94 season was a bad year for F1,but from the devastation driver safety became a major priority & no F1 driver has been killed since.

Total freak accident. He crashed at an angle where the suspension penetrated the lid I think.

I still find it amazing how barrichello survived his crash that weekend. Was the most violent looking of the 3 crashes