don't do what we did this year. There were 2 adults in our party (both of us dads of course) and we had 4 kids with us. We each took one of the youngest to ride the speedway with us, which left the oldest 2 to ride by themselves (ages 8 & 7). Not a major deal, but we should have put the 2 of them riding in a car between our 2 cars. Instead, they were in front of us. By the time we got back to the exit, they were nowhere to be found! After frantically running around the area for about 3 minutes screaming their names (and imagining the creative ways our wives were going to kill us), dad #2 found a cm working the line at indy speedway who told him that our girls wanted to ride around again so he just let them go! Not really his fault, but man were we relieved when they came back around.
So, if you ever need to put kids by themselves in a car on indy speedway, put them behind you, not in front!