Interstate 90

Interstate 90 is an east–west transcontinental freeway and the longest Interstate Highway in the United States at 3,021 miles. It begins in SeattleWashington, and travels through the Pacific NorthwestMountain WestGreat PlainsMidwest, and the Northeast, ending in BostonMassachusetts. The highway serves 13 states and has 16 auxiliary routes, primarily in major cities such as ChicagoClevelandBuffalo, and Rochester.

The route also incorporates several toll roads that predate the Interstate Highway System, including the Jane Addams Memorial Tollway, Indiana Toll Road, Ohio Turnpike, New York State Thruway, and the Massachusetts Turnpike.

The final section, near the western terminus in Seattle, opened in September 1993; an eastern extension in Boston was completed in 2003 as part of the Big Dig project.

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