The 1955 Le Mans disaster was a major crash that occurred on 11 June 1955 during the 24 Hours of Le Mans motor race at Circuit de la Sarthe in Le Mans, Sarthe, France. Large pieces of debris flew into the crowd, killing 83 spectators and French driver Pierre Levegh, and injuring around 120 more. It was the most catastrophic crash in motorsport history, prompting Switzerland to institute a nation-wide ban on motorsports altogether that lasted until 2022.
The crash started when Jaguar driver Mike Hawthorn pulled to the right side of the track in front of Austin-Healey driver Lance Macklin and started braking for his pit stop. Macklin swerved out from behind the slowing Jaguar into the path of Levegh, who was passing on the left in his much faster Mercedes-Benz 300 SLR. Levegh rear-ended Macklin at high speed, overriding Macklin's car and launching his own car through the air. Levegh's car skipped over a protective earthen berm at 200 km/h (125 mph) and made at least two impacts within the spectator area, the last of which caused the car to disintegrate, throwing him onto the track where he was instantly killed. Large pieces of debris, including the Mercedes' engine block, radiator, front suspension, and bonnet (hood), were sent flying into the packed spectator area in front of the grandstand. The rear of Levegh's car landed on the berm and exploded into flames.
There was much debate over blame for the disaster. The official inquiry held none of the drivers specifically responsible and criticised the layout of the 30-year-old track, which had not been designed for cars as fast as those involved in the crash.
Before the crash
There was great anticipation for the 1955 24 Hours of Le Mans, as Ferrari, Jaguar, and Mercedes-Benz had all won the race previously and all three automakers had arrived with new and improved cars. The Ferraris, current champions at the time, were very fast but fragile and prone to mechanical failure. Jaguar concentrated their racing almost exclusively on Le Mans and had a very experienced driver line-up, including Formula 1 (F1) Ferrari driver Mike Hawthorn.
After conquering F1, Mercedes-Benz had debuted its new 300 SLR in that year's World Sportscar Championship, including a record-setting win at the Mille Miglia for Stirling Moss. The 300 SLR featured a body made of an ultra-lightweight magnesium alloy called Elektron. The car lacked the more effective state-of-the-art disc brakes featured on the rival Jaguar D-Type, instead incorporating inboard drum brakes and a large air brake behind the driver that could be raised to increase drag and slow the car.
Mercedes team manager Alfred Neubauer assembled a multinational team for the race: pairing his two best drivers Juan Manuel Fangio and Stirling Moss in the lead car, 1952 race-winner Karl Kling with Frenchman André Simon (both also in the current F1 team) and American John Fitch with one of the elder statesmen of French motor-racing, Pierre Levegh. It had been Levegh's unprecedented solo drive in the 1952 race that failed in the last hour, which allowed Mercedes-Benz their first Le Mans victory.
Aside from two layout changes to make the circuit shorter, the Circuit de la Sarthe was largely unaltered since the inception of the race in 1923, when top speeds of cars were typically in the region of . By 1955, top speeds for the leading cars were over . That said, the circuit had been resurfaced and widened after the Second World War. The pits and grandstands had been reconstructed, but there were no barriers between the pit lane and the racing line, and only a earthen bank between the track and the spectators. The cars had no seat belts; the drivers reasoned that it was preferable to be thrown clear in a collision rather than be crushed or trapped in a burning car.
The 1955 race began at 4pm on Saturday, and, as predicted, the lead cars of Eugenio Castellotti (Ferrari), Hawthorn (Jaguar), and Fangio (Mercedes-Benz) were at the head of the field in the first hour. The other team cars were being kept on tighter leashes to conserve the cars, but still racing in the top ten. Going into the second hour, Castellotti started dropping back, but Hawthorn and Fangio continued the duel, swapping the lead and dropping the lap record further and further, lapping most of the field.
The accident happened at 6:26 pm, at the end of lap 35, when the first pit stops for the leading cars were starting.