DAYTONA, Fla. -- The Daytona 500 wraps up International Speed Week and safety on the speedway has become a top concern after Saturday night's horrific crash.

Seven people are still at Halifax Medical Center recovering from traumatic injuries such as broken bones and fractures. Although it is not common, Saturday's crash isn't the first time debris has made it over the safety fence and into the grandstands.

During the last lap of Aaron's 499 Sprint Cup Race at Talledega in 2009, seven fans were injured when Carl Edwards' car went flying into the catch fence.

In 1998, three fans were killed when a flying tire went over the fence and into the grandstands at a CART race at the Michigan International Speedway.

All of these tragedies during races have prompted more security in the speedway, but after Saturday's Nationwide series multi-car crash, no spectator had ever imagined how unprotected they could be behind the safety fence.

"You got to realize a motor was sitting in the stands. And a wheel, and I don't mean a tire, I mean a wheel with a brake on it and everything, flying over your head and debris everywhere and smoke and people crying," said Terry Huckaby, brother of injured fan.

Huckaby was at the race Saturday and was sitting with his brother Eddy, who was hit by a metal object. He's still being treated at the Halifax Medical Center whereeleven others were transported.Fourteen were treated at the speedway after they were injured by debris when NASCAR driver Kyle Larson's car tore a hole through the safety fence.

As a precaution, two NASCAR fans wore helmets to the race Sunday. Steve Turner was at the Daytona 500 near the section of Saturday's crash and says he wasn't nervous about his seat.

"It didn't bother me too much," said Turner. "You can walk out your door tomorrow and get hit by a car or get in an accident."

167,000 fans were at the Daytona 500.