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Interstate 90

Interstate 90 is the longest interstate highway in the United States. It begins in Seattle, Washington at 4th Avenue S. next to Seahawks Stadium and ends in Boston, Massachusetts at Logan International Airport.

Table of contents

Number of Miles 3112.82

Major Cities Along the Route

Intersections with other Interstates

Spur Routes

Notes I-90 terminated at Interstate 93 in Boston until it was connected through to the Ted Williams Tunnel[?] in January 2003 as part of the Big Dig, extending I-90 to Boston's Logan International Airport, an additional 1.3 miles beyond the 3111.52 miles already paved.

You can't be the longest Interstate without having a few quirks. In Montana right by the Idaho border, I-90 is not a divided highway for a few stretches. The speed limit there is still "reasonable and prudent".

Not only is the I-90 section of the NYS Thruway marked backwards, with mile numbers going down as you go east, but there are two metric only signs when you drive westbound. They are around Syracuse, which is nowhere near Canada. The NYS Thruway admin decided to test metric signage (which I am told included [briefly] an 88 km/h speed limit sign) on the Thruway. Now the legend part: When one of the metric pushes was on, the state representative from that district was deadset against it. The Thruway chose his district (Liverpool, next to the former GE plant) as the test site.

If you care, I-990 is the highest number given to an Interstate.

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