Following Dan Wheldon's death at the IndyCar race in Las Vegas on Sunday, his fellow drivers mourned the loss of their friend — then began to talk openly over Twitter about organizing themselves to push for safety changes.

While the inevitable questions of how IndyCar ran open-cockpit cars on high-banked ovals, the racers concers' are broader, and reflect their knowledge the sport. IndyCar drivers formed an association last year to speak out about safety, with former series champion Tony Kanaan among its leaders, but Wheldon's death spurred several drivers to air their concerns publicly.

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