Preston Bypass (M55):
That said, I'm not sure it was ever seriously considered by the military.
I also believe the A-1 by Woolfox Lodge was suspiciously straight and level on one side, and with RAF Woolfox Lodge just off to one side I guess we could have used it in the early days of Harrier but can't say whether it was ever actually trialled - someone on here will know I am sure.
STH