Interstate 90 (
I-90) is a transcontinental
freeway, and the longest
Interstate Highway in the
United States at . Its western terminus is in
Seattle, at Edgar Martinez Drive S. near
Safeco Field and
CenturyLink Field, and its eastern terminus is in
Boston, Massachusetts, at
Route 1A near
Logan International Airport. I-90 crosses the
Continental Divide over
Homestake Pass just east of
Butte, Montana. East of the
Wisconsin-
Illinois border, much of I-90 follows several
toll roads, many of which predate the Interstate Highway system. The
Jane Addams Memorial Tollway,
Chicago Skyway,
Indiana Toll Road,
Ohio Turnpike,
New York State Thruway,
Massachusetts Turnpike, and the
Ted Williams Tunnel are all toll roads used by I-90 in the eastern half of the country. The Interstate is not tolled through some segments in downtown
Chicago;
Greater Cleveland, and the rest of
Northeast Ohio;
Pennsylvania; and through brief sections near
Buffalo;
Albany; and
Boston.
Erie, Pennsylvania;
Billings, Montana; and
Spokane, Washington are other major cities on I-90.