zaphod wrote:

OK, This sounded a little strange to me, but during lunch today with some
co-workers, someone asked if I knew of some rules regarding interstate
construction. They had heard a bit of trivia that claimed that an
interstate highway must have sections that are straight, level, and long
enough for a plane to land(at least 1 mile they thought.) I had never
heard of such and was wondering if anyone here knows what they were talking
about?

c
Go to Australia and drive from Adelaide to Perth, and you will find 3
emergency runnways marked on highway 1 for the Royal Flying Doctor to
use. They are a few hundred miles apart between Ceduna and Norseman.