Everything depends on your position, especially if you are going to try to shoot from your seat. If you are not where you can see the cars above the catch fence, you will have one h*ll of a time shooting thru it. This one was taken over the fence, I had a pretty good view of the pits from my seat.
If you can get a pit pass to get close to the cars and action, that would be great. Pit passes are rather expensive and you have to be a season ticket holder to buy one.
Access to anything but the general areas is very hard unless you have some kind of "in". media credentials can be obtained, but you have to be legit with a newspaper or magazine, or other media. It's all on the texasmotorspeedway.com web site.
There is a lot of stuff to shoot along the Merchandising Trailer rows. Look for the driver appearances posted at their trailers, and try to be there at that time. I got a couple last April, mostly due to prowling the rows, and a lot of luck.
Here's my gallery from April of this year to give you a couple of ideas.
http://www.pbase.com/jerrykneupper/tms__2005
Also look for "show car" appearances Thurs and Fri. at some of the local sponsor's stores, like Home Depot, Lowes, Albertson's, etc. The actual drivers rarely show up, but you can get up close to a real car, usually from a previous year, but in current paint and decal.
Hope this helps. NASCAR races are really fun to attend.
-=- Jerry -=-
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