The state of mind one gets after driving on the highway/interstate for an extended period of time, where the driver feels like they are driving slow once on city and residential streets, and/or speed without realizing it.
After driving for hours Thomas got off the highway and had interstate mind, and found himself speeding through the neighborhood.
by Apauld November 15, 2015
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Phenomena that occurs after exiting the interstate in which the driver continues to drive at high speeds (65+) through low speed zones (30-) such as neighborhoods and school crossings. Many speeding tickets are thought to be the result of this.
"Do you know how fast you were going through town?"

"75, I know....I'm still in the interstate of mind."
by dedle January 2, 2012
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