The longest Interstate Highway, Interstate 90 serves major northern cities such as Seattle, Chicago, Cleveland, Buffalo, Albany, and Boston. South Bend, Toledo, Erie, Syracuse, and Springfield also dot Interstate 90 on its travels. The eastern third of Interstate 90's routing predates the Interstate system and follows tolled turnpikes. In 1999, it was deemed that the Chicago Skyway was not up to current Interstate standards. It is unclear if there are upgrades planned to bring the Skyway to current Interstate standards.
More information is available on the official website .
See also the Interstate 93 Terminus page for more. Western Terminus Begin Interstate 90 East at Safeco Field. Signage for the exits at the end. Closeup of the MA I-93 on the last sign. I-93 gore signage.