Since 1956 the Interstate Highway System has become an indispensable way to transport goods and move people, connecting cities across the country. Watch it grow over several decades and explore the map to see the history of your area.

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1956

1,578 miles covered

{The trailblazer:} Missouri’s I-70 (aka Mark Twain Highway) is the first interstate to be fully constructed with funding from the Federal Highway Act.

1957

4,914 miles covered

1958

6,112 miles covered

1959

7,581 miles covered

1960

8,226 miles covered

1961

8,346 miles covered

1962

10,633 miles covered

1963

12,328 miles covered

1964

12,662 miles covered

1965

13,595 miles covered

1966

15,415 miles covered

{Pedal to the metal:} Averaging roughly four miles per day, the U.S. adds over 15,000 miles to the Interstate Highway System within the first ten years.

1967

16,133 miles covered

1968

20,633 miles covered

1969

22,557 miles covered

1970

23,525 miles covered

1971

25,308 miles covered

1972

27,172 miles covered

1973

27,943 miles covered

1974

28,940 miles covered

1975

30,416 miles covered

1976

33,464 miles covered

1977

34,295 miles covered

1978

35,304 miles covered

1979

36,499 miles covered

{Border to border:} The completion of I-5 in California links Canada and Mexico with one seamless route.

1980

37,964 miles covered

1981

38,538 miles covered

1982

39,304 miles covered

1983

39,504 miles covered

1984

39,955 miles covered

1985

40,494 miles covered

1986

41,186 miles covered

{Connecting the coasts:} Final sections of I-80 open to traffic, making it the first coast-to-coast highway.

1987

42,385 miles covered

1988

42,834 miles covered

1989

42,887 miles covered

1990

43,949 miles covered

1991

44,163 miles covered

1992

44,828 miles covered

{Mission I-70 accomplished:} 36 years after the first section was constructed in Missouri, I-70 opens in Colorado as it was originally envisioned in the Federal-Aid Highway Act of 1944.

1993

44,863 miles covered

1994

44,888 miles covered

1995

45,434 miles covered

1996

45,767 miles covered

1997

46,146 miles covered

1998

46,146 miles covered

1999

46,193 miles covered

2000

46,193 miles covered

2001

46,193 miles covered

2002

46,205 miles covered

2003

46,263 miles covered

2004

46,271 miles covered

2005

46,271 miles covered

2006

46,279 miles covered

2007

46,510 miles covered

2008

46,603 miles covered

2009

46,603 miles covered

2010

46,603 miles covered

2011

46,680 miles covered

2012

47,106 miles covered

2013

47,237 miles covered

2014

47,252 miles covered

2015

47,616 miles covered

2016

47,711 miles covered

2017

47,783 miles covered

2018

47,814 miles covered

{Over 60 years later (and counting):} Totalling over 47,000 miles, the Interstate Highway System accounts for 25% of all highway traffic in the United States.

1956
0Miles covered
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The Interstates appear in their mileage and shape provided in the National Highway Planning Log from 2015, with Interstates in Alaska and Hawaii added in manually. The shapes and mileages of the highways were manually adjusted to address later changes to their original mileage wherever possible. Only the Interstate Highways that are designated as such as of August 2018 are shown on the map.

The opening years of the Interstates were sourced from Federal Highway Administration, Departments of Transportation (or equivalent authorities) in individual states, articles covering or referencing the opening of the Interstates in local, national, and industry media, and enthusiast sites with references to the official sources.

The year each interstate opened corresponds to the year the route of the interstate through a given state has been fully built, opened to traffic, and designated as part of the Interstate Highway System.

Historical notes were taken from “History of the Interstate Highway System” by FHWA.
Explore the map using the controls to slide through time, zoom in and pan around. Click the shields to view details of individual freeways.