Just an interesting note, this race will begin at 5:15PM local time today. It has been hot all week in California, and its currently 100 degrees Farenheit, at 7:40AM... 
If nothing else, racing 500 miles in an unairconditioned closed-top car in that kind of heat will be tough.
Edit - 7:50 AM, 105 degrees... ouch
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If nothing else, racing 500 miles in an unairconditioned closed-top car in that kind of heat will be tough.
Edit - 7:50 AM, 105 degrees... ouch