I know what makes the Indy 500 special. It's significantly longer than the other Indy Car races, with the largest field of the season (admittedly padded out with field fillers), on the oldest track on that circuit.
What exactly does 'Super Bowl of NASCAR' mean? What makes the D500 the 'Super Bowl'? Last time I checked, football's Super Bowl came at the end of the season and determined the champion. It's not the longest race, oldest track, longest track, or largest field. Okay, it's got a Q format we all despair of when our non-racing friends ask us to explain what determines who starts where. But what makes the race itself stand above the other plate races, or any other races, other than it's first?