10 Years Later: How Dale Earnhardt's Death at Daytona 500 Changed NASCAR

Feb. 19, 2010 -- The drivers of NASCAR's Sprint Cup Series will start their engines Sunday at the 53rd running of the Daytona 500 and five-time defending champion Jimmie Johnson is on a quest for an unprecedented sixth-consecutive series title.

But the weekend will also be marked by somber tributes. Sunday's race in Daytona Beach, Fla., will be the 10-year anniversary of Dale Earnhardt Sr.'s death on that same track.

His crash on the final turn of the final lap brought the racing world to a screeching halt and changed NASCAR forever.

The death of Earnhardt, a stock-car legend, brought sweeping safety changes to the dangerous sport.

"I believe it required us to study longer, work harder and understand what the limitations of the human body are and really study the impacts, not only on the car but residual effects on the body," said Ricky Craven, a former NASCAR driver and a racing analyst for ESPN. "NASCAR has implemented some great changes. They have built a safer race car. They have mandated devices that have helped to keep drivers protected."

Tracks now have softer crash-walls, cars have better seat-belt systems and roll-cages and NASCAR drivers are now required to wear a head-and-neck safety device.

Earnhardt refused to wear one and many experts believe it would have saved his life.

"[Drivers] don't want something new to come into their environment, something that can distract them or slow them down," Craven said. "Any change that they would perceive to be a negative, they resist it.

"And they think that they are resilient and could survive anything and give little consideration to being hurt until someone, a member of your family, is injured or fatally injured and then get's everybody's attention."

Earnhardt's son, Dale Jr., followed his dad into the racing business. He said this week that he wants to move on from that tragic day 10 years ago.

"I'm sure 110 damn percent my dad would not want me discussing this 10 years later," Earnhardt said. "He would be like, "Look, quit. You've done it. You did it.'"