How it unfolded
Wayne Rainey had won three straight 500cc titles for Yamaha from 1990 to 1992 and led Kevin Schwantz by 11 points in the 1993 championship. At Misano, while leading the race, he lost the front and crashed. His body separated from the bike, tumbled through a gravel trap, and injured his spine, leaving him permanently paralysed from the chest down at age 33. He did not race again that season, and the championship went to Suzuki's Kevin Schwantz, who had won 25 races without ever taking a title. The two men's rivalry had been the sport's central axis since the late 1980s, and Schwantz later said he never wanted his only world title to come this way. Misano was later rebuilt extensively, with its direction of travel reversed, before returning to the Grand Prix calendar in 2007.
Why it still matters
The accident exposed that danger in the 500cc era came not only from rider error but from circuit design itself, and it triggered a reassessment of gravel traps, run-off areas and air fences. Rainey became a symbolic figure in the safety debate that followed, and his crash is frequently cited as the starting point of a chain leading to the airbag suits made mandatory across all classes in 2018.