Pretty good read, old tunnel in Pennsylvania being used for Nascar testing.
http://blogs.insideline.com/straigh...d-race-car-test-track-is-probably-batman.html
http://www.racecar-engineering.com/articles/nascar/the-secrets-of-laurel-hill/
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http://blogs.insideline.com/straigh...d-race-car-test-track-is-probably-batman.html
http://www.racecar-engineering.com/articles/nascar/the-secrets-of-laurel-hill/
[YOUTUBE]s-f_0z3HARI&feature[/YOUTUBE]