IMOLA, ITALY – Thousands of fans joined Formula One drivers past and present on Thursday in marking the 20th anniversary of the death of Ayrton Senna at the Italian circuit where the triple champion crashed 20 years ago.

They thronged the track to observe a minute’s silence at the Tamburello corner at 2.17 p.m., the moment the Brazilian’s Williams plowed into the wall while leading the 1994 San Marino Grand Prix.

Many carried flags and some pointed to the sky, as Senna did when he won, in remembrance before breaking into applause when the minute ended.

Austrian rookie Roland Ratzenberger had died the day before Senna, when he crashed during qualifying, and the two remain the last driver fatalities during a Grand Prix weekend.

The circuit near Bologna was opened to the public with tribute events scheduled in Imola, including a memorial soccer match and the naming of a square, over the next four days. According to organizers, some 20,000 people attended on Thursday.

“It’s so emotional for us because it’s a long time and still the love from the people is very alive,” Senna’s niece Paula, representing the family, told Reuters Television.

“It seems like Ayrton is living inside people’s hearts, so it’s beautiful.”

Current Ferrari drivers Fernando Alonso and Kimi Raikkonen, as well as Senna’s friend and former McLaren teammate Gerhard Berger, were among those present at the track.

“For me he was an idol. I was a kid who rode karts, and back then I watched the news and saw that it was always him winning with his yellow helmet on,” said double world champion Alonso, who was 12 when Senna died. “That was what hit me the most.

“I had his poster on my wardrobe and it’s a shame that I never got to know him or race against him, but the number of people here at Imola . . . is a testament to his impact. He will always be immortal.”

Senna’s favorite Sao Paulo soccer team Corinthians donned replicas of his distinctive yellow, green and black helmet before the start of a Cup match against Nacional in Manaus on Wednesday.

“He was the best and most charismatic race driver F1 has ever had,” said Austria’s triple champion Niki Lauda, now non-executive chairman of the Mercedes team. “He had personality, he was fast and he had charisma. No wonder that he won everything.”

Italian MotoGP great Valentino Rossi spoke on Twitter of Senna as “an inspiration, and even if 20 years have passed his spirit lives on in all racing riders and drivers.”

Jean Todt, the president of the governing International Automobile Federation (FIA), said in an address delivered on his behalf that the fight to improve safety would never cease and there could be no complacency.

“No matter how secure we may feel that injuries and fatalities are a thing of the past, the battle for completely safe racing is never won,” he said.

“The untimely deaths of these two superb sportsmen served as a wake-up call for all of us,” added the Frenchman.

“Perhaps the greatest legacy of Ayrton and Roland is that in the wake of that dark weekend in 1994, the pursuit of safer motor sport, in all its forms, received greater impetus than ever before.”