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Worst Indy 500 crash? During practice for the 1991 Indianapolis 500, rookie Mark Dismore suffered one of the most violent crashes in Indy history. While exiting Turn 4 at over 215 mph, Dismore brushed the outside wall, which broke his car’s suspension and sent him spinning backward toward pit road. His car struck the inside fence, burst into flames, then slammed nearly head-on into the end of the pit wall—an impact so severe it ripped the car in two and exposed Dismore’s legs. He endured a broke