The fences at Daytona and Talladega will be raised from 14 to 22 feet following a safety analysis conducted after Carl Edwards' airborne flight into the Alabama track's safety barrier.

A wreck on the last lap in April's race at Talladega sent Edwards sailing into the fence. It bowed, but held and his car shot back onto the track.

Debris from the accident injured seven fans in the stands, the most serious a broken jaw suffered by a teenage girl.

The frontstretch fence at Talladega will be raised before the Nov. 1 race, and the backstretch will be completed during the offseason. Daytona will have its fences raised before its first big event in January.