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What does IH stand for?

IH stands for Interstate Highway

This definition appears very frequently

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Other Resources:
We have 27 other meanings of IH in our Acronym Attic

Samples in periodicals archive:

When Eisenhower became president, other good roads advocates like Bureau of Public Roads chief Thomas MacDonald would persuade Congress to pass the Federal-Aid Highway Act of 1956, which Eisenhower signed, creating the mechanism for the Interstate Highway System.