Some Little-Known Facts About America's Interstate Highway System03:49
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Vehicles travel along Interstate 70 near Odessa, Missouri (Charlie Riedel/AP)MoreCloseclosemore
Vehicles travel along Interstate 70 near Odessa, Missouri (Charlie Riedel/AP)

Interstate highways in the United States stretch more than 47,000 miles, with more planned in coming years. At 60 years old, it is not hard to argue the impact of the Federal Highway Act of 1956, which propelled the Interstate Highway System into existence.

In the second of a two-part look at America's highways, Here & Now's Jeremy Hobson offers some little-known facts and figures about the system.

Hear part one of our look at America's interstate highway system

10 Interstate Highway Facts

  • The Interstate Highway System stretches 47,622 miles and includes 10 transcontinental routes varying from 18 miles to 3,000 miles.
  • Longest: I-90, 3,085.3 miles (Seattle to Boston)
  • Shortest: I-97, 17.6 miles (Annapolis to Baltimore, Maryland)
  • State with the most Interstate mileage: Texas, 3,232.04 miles
  • State with the most Interstate routes: New York, 29 routes
  • Interstate routes across the most states: I-95, 16 states (Florida to Maine)
  • Heaviest traveled Interstate: I-405, 374,000 vehicles per day
  • Annual spending on the Interstate Highway System is estimated to be $20.2 billion
  • Highest: 11,158 feet (I-70, Eisenhower Tunnel in the Colorado Rocky Mountains)
  • Lowest: −103 feet (I-95, Fort McHenry Tunnel under the Baltimore Inner Harbor)

Trivia From Senior Editor Micheline Maynard

This segment aired on June 30, 2016.

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