>> Federal funding for the interstate system was originally separate from
>> the federal highway system.  There are (were?) laws on the books that
>> made the interstate system 'belong' to the defense department in
>> particular emergencies.  I'm not up on whether all the old distinctions
>> still exist.
>
>
> At one point there were supposed to be fallout shelters under the
> overpasses, and the roads can be turned into runways.

And, or at least I was taught:, the roads were designed to handle tanks 
without serious damage.

Bob Ammemran
RAm Systems 

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