Arkansas State Highway and Transportation Department

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The Arkansas State Highway and Transportation Department (AHTD) is a state government organization in charge of maintaining the transportation infrastructure of the U.S. state of Arkansas.

AHTD, the Massachusetts Highway Department, and the Nebraska Department of Roads are the only state transportation agencies in the United States whose name still refers to "highways" or "roads"; most others are now known as the "(name of state) Department of Transportation" after the U.S. Department of Transportation. The "Highway" in AHTD's name is largely required by the Arkansas Constitution which created the Arkansas Highway Commission as its governing body; the Constitution still calls it the "State Highway Department", but the legislature added "and Transportation" to its name in 1977. Many people in Arkansas continue to call it the "Highway Department" to this day.