Well, almost everything. The stands may be full, but the crowd is silent. As mentioned, this is a very adjustable game. You can get the experience you want from it. Players control the length of the race, can turn yellow flags off and on, set the number of computer controlled cars to race against, and even control the weather.
Players can choose an arcade style race, or go for a realistic ride in sim mode.
Run a single race at the track of their choice, or go for the Winston Cup Championship over a full season. There's the testing session, just you and the race track. Then there's on-line racing to consider. I haven't tried this yet, so I really can't say anything about it. A race actually consists of four sessions.