Only vaguely related, but there used to be a 17 mile long stretch of highway in South Carolina that went through the grounds of the Savannah River Site. In the

Only vaguely related, but there used to be a 17 mile long stretch of highway in South Carolina that went through the grounds of the Savannah River Site. In the cold war days, that's where they produced nuclear material for bombs. The highway was open to the public, but you had to check in at both ends as you entered and left the site. You were given a pass with time written on it, and if you took too long to pass through the site, you could be subject to additional interrogations and searches. As far as I know, it was the only highway where taking to long to cover distance could get you into trouble.