1m - IndyCar
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- Associated Press
INDIANAPOLIS -- IndyCar has mandated the use of closure panels to the rear wheel guards for the remaining three superspeedway races after three cars went airborne during preparation for the Indianapolis 500.
The panels will be required for both Chevrolet and Honda and will debut Saturday night at Texas Motor Speedway. They also will be used at Auto Club Speedway in California and Pocono Raceway later this season.