tonight about that terrifying crash at the daytona 500. Debris flying into the stands and injuring more than two dozen fans. Drivers now speaking out about safety for the crowds. And for the first... See More
tonight about that terrifying crash at the daytona 500. Debris flying into the stands and injuring more than two dozen fans. Drivers now speaking out about safety for the crowds. And for the first time here, we are listening to a 911 call from a fan. Abc's matt gutman in florida again tonight. And a terrible crash! Reporter: Tonight, you hear the desperate 911 calls -- there's been a crash. And these people are really serious. We need help. Big time quick. Reporter: Kyle larson's car catapulted into the metal catch fence and then disintegrating. An engine block spearing through the fence, a tire lobbed over it, into the seating. That scene spurring soul-searching among drivers. We've known since racing was started this is a dangerous sport. We assume that risk and it's hard when the fans get caught up in it. Reporter: The catch fence made of steel was 14 feet high. Oh, my gosh. Reporter: Until this 2009 crash. It was then raised from 14 feet to 22 feet. Still, in saturday's cash, parts of the car broke through it. They had to replace a 1,200 square foot patch of the fence. The question tonight, is the fence high enough and strong enough to protect fans? Nascar says they are investigating the crash to determine if they can make fans even safer.
This transcript has been automatically generated and may not be 100% accurate.