In a spectacular last-lap accident, Edwards' car sailed upside-down into the frontstretch fence, which bowed but held, before the battered vehicle returned to the track. Blake Bobbitt, one of seven injured by debris, remained hospitalized Monday with a broken jaw.

"One of our primary goals over the years is to build a retaining fence that keeps the cars and parts and pieces out of the spectator areas. Nothing is bullet proof," NASCAR spokesman Jim Hunter said Monday. "The retaining fence did what it's supposed to do. There was some debris that went into the grandstand, that fortunately did not invoke serious injury. If there is something we come up with as we analyze this accident ... we'll make it as safe as we humanly can."

The frightening ending marred what was easily NASCAR's best race of the season. There were 57 lead changes among 25 different drivers, and a nail-biting last-lap charge from Edwards and Brad Keselowski, who teamed together to run down Ryan Newman and Dale Earnhardt Jr.

NASCAR vice president Robin Pemberton acknowledged the fine line between creating exciting racing and keeping the competitors safe.

"It's tough to balance out," he said. "Our series is 22 different race tracks ... with speeds from 100 mph to well over 200 mph, and not every driver likes every race track that we run on. That's part of our season and that's part of what makes it work."

NASCAR had no immediate solutions as to how to prevent future similar accidents but will evaluate the fence height surrounding the race track and beef up its policing of aggressive driving and blocking, when one car deliberately moves into the path of a competing car trying to pass it.

On the final lap of Sunday's race, Edwards tried to block eventual race-winner Keselowski's pass as they hurtled down the frontstretch at nearly 200 mph. Edwards slid low when Keselowski dipped underneath him, and the block caused Keselowski to hook the left rear of Edwards' car, sending it spinning into the path of Newman.

Newman then hit Edwards' car, causing it to fly off the track and into the safety fence. Edwards emerged from the fiery wreckage unscathed, and jogged across the finish line.

"Quite frankly, these situations that come up from time to time are a one-off - you don't necessarily foresee (them) and they are hard to recreate," Pemberton said.

The accident renewed scrutiny of restrictor-plate racing, which produces thrilling racing but carries inherent risk.

The horsepower-sapping restrictor plates are used at Daytona and Talladega - NASCAR's two fastest - to combat the high speeds. A square aluminum plate is installed in each car to limit its engine's power, slowing the car by reducing the amount of air that flows into the carburetor. As a result, the cars all run the same speed, and the field is typically bunched tightly together. One wrong move by a driver can cause a massive accident.

There were three spectacular crashes Sunday: A 13-car wreck seven laps into the race; a 10-car accident with nine laps to go; and Edwards' airborne flight into the fence on the final lap.

Most of the drivers were highly critical of the racing afterward, particularly because so much is out of their control and so many cars end up in a scrap heap.

Edwards, grateful the fence held, warned that restrictor-plate racing can kill someone.

"I don't know if I could live with myself if I ended up in the grandstands," Edwards said. "We'll race like this until we kill somebody, then (NASCAR) will change it."

Even Earnhardt, who's been very successful at Daytona and Talladega, expressed concern that the fascination in the danger at those two tracks had allowed the racing to go too far.

His father, the late Dale Earnhardt, was killed on the last lap of the 2001 Daytona 500 in an accident created partly because the elder Earnhardt was blocking.

"For years, we've had wrecks like this every time we've come to Talladega. Ever since the plate got here. And for years it was celebrated," Earnhardt Jr. said. "The media celebrated it, the networks celebrated it, calling it 'The Big One,' just trying to attract attention.

"So there's a responsibility with the media and the networks and the sanctioning body itself to come to their senses a little bit."

But racing has always been frightening.

In 1987, Bobby Allison, too, went airborne while running over 200 mph, colliding into the steel-cable fence and scattering debris into the crowd at Talladega. That scary crash led to the use of restrictor plates.

But Allison said Monday that Edwards was overstating the danger of plate racing but acknowledged those scary thrills are what draws fans to one of NASCAR's most popular tracks.

"Part of the attraction of Talladega is the potential for danger," Allison said. - AP