Intrastate is a 10 letter English word. It's valid Words with friends word worth 11 points.
You can make 603 anagrams from letters in intrastate (aaeinrsttt).
An Americanism dating back to 1900-05; intra- + state
Then, the explanation is—although the classifications changed from interstate to intrastate, it was the same claim.
And this despite the fact that the vast majority of freight traffic is interstate, rather than intrastate.
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