Indy Car is mandating some aero changes for the remaining fast oval tracks. I think it's a good idea and hopefully there won't be more cars getting airborne on their own.
http://www.foxsports.com/motor/story/indycar-mandates-closure-panels-to-keep-cars-on-ground-060215
http://www.foxsports.com/motor/story/indycar-mandates-closure-panels-to-keep-cars-on-ground-060215