Ayrton Senna and was subsequently given a one-race suspension. 1991 First Union 400: After an offseason of discussion at the end of the NASCAR season during the Atlanta Journal 500 when Melling Racing rear tyre changer Mike Rich was killed by Ricky Rudd's car going out of control during a pit stop, NASCAR experimented with various rules on tyre changes in an attempt to prevent a similar incident from happening again. The first was to only allow tyre changes during green flag racing, with the first lap after the restart being assigned to cars that started in odd-numbered starting positions, and the second lap after restart for even-numbered starting positions. The rule was unpopular, and teams began to change tyres only for regularly scheduled times under the green flag. After the first five races, NASCAR experimented with a rule for the Valleydale Meats 500 in Bristol. The same odd–even rules were used for the first two laps of a pit stop under caution, with the cars starting double-file, with the odd cars on the inside and even cars on the outside. After more complaints, for the seventh race, at North Wilkesboro Speedway, NASCAR reverted to the rules prior to the 1990 crash, along with a new rule mandating a pit lane speed limit. By the middle of the 1990s, almost all motorsport began enforcing a pit lane speed limit. 1991 Toyota Grand Prix of Long Beach: Michael Andretti's pit service was complete as he passed by Emerson Fittipaldi, who began exiting his pit area. Fittipaldi was apparently unaware that Andretti was approaching, and as the two made wheel-to wheel contact Andretti's car was launched into the air. Andretti's damaged car slid into another pit stall, but, though very angry, he walked away uninjured. As this incident took place in the wake of the aforementioned First Union 400, this incident prompted CART to mandate pit lane speed limits. 1991 Portuguese Grand Prix: Nigel Mansell lost a wheel instantly after making his stop. The mechanics put the wheel back on in the middle of pit road, and Mansell was disqualified for the second time in three years in the event. 1993 European Grand Prix: On lap 57, Ayrton Senna came into the pit lane for a tyre change but aborted the stop and drove straight through instead. In the process, he ended up setting the fastest lap of the race, due to