And it's been that way since the start.
I was talking to one of the Zoltz racing guys and he said that every time they consider repaving Sebring - they get worried that it will be too fast. The bumps tend to keep some of the speeds down. Not sure how much truth there is to that - but it sounds reasonable.
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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