Laurel Hill Tunnel

[slantasaurus]

http://www.msn.com/en-us/autos/enthusiasts/the-secret-racing-test-tunnel-no-one-wants-to-talk-about/ar-AAeXjJP?li=BBgzzfc#page=1

Very interesting story of one of the most top secret test facilities in racing. 

[vintagercr]

That's an interesting read.

[bismarck]

I read that article too. Yes, its a very interesting read.

[Petetrucker07]

I agree, I interesting stuff.

[Art Anderson]

There is at least one video on Youtube about the original tunnels on the original stretch of the PA Turnpike as well--don't remember the name of it, but watched it a couple of months ago, interesting!

Art