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Interstate 495/Route 9 Interchange Improvement Study

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Approximate Study Area

MassDOT's Office of Transportation Planning (OTP) has completed a study of the interchange of Interstate 495 and Route 9 in the Towns of Westborough and Southborough and the surrounding region, including the I-495 and I-90 interchange. The Final Report is available below. The purpose of the study was to address traffic congestion and safety issues surrounding the interchanges as well as congestion impacts on the two highway facilities. The study report is based on the work done as part of the 2011 study.

Additionally, MassDOT recently filed an Environmental Notification Form with the Executive Office of Energy & Environmental Affairs for the All-Electronic Tolling System Implementation Project.

Final Report

Stakeholder Meetings

Study Advisory Group Meetings

Portable Document Format (PDF) documents require Adobe Reader, which is available for free on the Adobe Website. Please read MassDOTAccessibility Statement for additional information.

For additional information, please contact:
Ethan Britland, Project Manager
(857) 368-9800

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