Oh yes! rem the race at Indianapolis in 2006 shown live on tv. me thought oval shape purely meant for controlling high speed of a car?? but still they race with high speeds. ovals are something to do with straight line speed n steep banking angles to control the speeds. these guys like to cut down costs with more or less same type of track?? different tracks in motogp n f1 are laid coz every event happens in different country?? Indy car series held only in US that saves more money?? dunno one element is surely there. competition in the air vroommmmmm. lolz.