I just got back from driving Texas Motor Speedway last weekend - I have to say it is pretty damn wild driving the banking - passing someone on the high side doing 110 - big pucker factor and wild as hell looking down on them! Unless you have done it - I see no way you can have an appreciation for it. Pretty wild shifting through the corners and feeling the car hunker down the faster you go. 135 was fast enough for me - I can't imagine 180...
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"If you can make black marks on a straight from the time you turn out of a corner until the braking point of the next turn, then you have enough horsepower"
-Mark Donohue