Accidents are nothing new to NASCAR, where cars often cruise at speeds near 200 mph, nor are they new to the Daytona track. One of the sport's most horrific, and well-known, wrecks happened in the 2001 Daytona 500, when seven-time NASCAR champion Dale Earnhardt Sr. was killed -- also on that race's final lap.

Still, injuries and fatalities to spectators are much rarer.