I've personally heard "Contraflow" mentioned for the switchover's some DOT's have on Interstates for Hurricane (or other) evacuations in the press. I know I-95 in Georgia happens to have two such crossovers, but they don't specifically say "contraflow" on the signs. Here are links to how they do it:
http://img.photobucket.com/albums/v645/rickmastfan67/Interstates/GA/I-95/P1000336s.jpg http://img.photobucket.com/albums/v645/rickmastfan67/Interstates/GA/I-95/P1000337s.jpg This is at MM 59. The pictures are from 2008. Meanwhile, I've mostly only heard the word "counterflow" around here.
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