>Only one reason, really. The available BIG lots -- i.e. airport aprons --
>are concrete.
>
>We did not go looking for concrete, we went looking for size, and the size
>we found happened to be concrete.
Bingo, Rocky.  
If you were to build a dedicated autocross facility, you would be better off
using full-depth bituminous than you would be using concrete.  Cheaper, easier
to maintain, recyclable on-site.
If you are looking for an available existing lot, that's another story, and
not the the question to which I replied.
Phil Ethier
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