Vermont’s First Diverging Diamond Interchange

The Vermont Agency of Transportation (VTrans) is improving the roadway along the U.S. Routes 2/7 (U.S. 2/7) corridor, in the vicinity of Interstate 89 (I-89) Exit 16, to enhance mobility and safety in Colchester, Vermont. The project area extends from the Colchester-Winooski town line north for approximately 1 mile to just beyond the intersection of Sunderland Woods Road at U.S. 2/7. The core of the project is to reconfigure the existing tight diamond interchange to a Diverging Diamond Interchange at I-89 Exit 16.

Learn more about this and other improvements

Image of Interchange

Project Updates

Weekly Construction Update - Friday, July 24, 2026

DATE: Friday, July 24, 2026

TRAFFIC IMPACT AND DURATION: Nightly, starting the evening of Sunday, July 26, through the morning of Friday, July 31, between 9 p.m. and 6 a.m., unless otherwise noted:

  • Lane closures along alternating sides of U.S. 2/7 between South Park Drive and Mountain View Drive, with two-way traffic maintained under lane shifts.
  • Short intermittent stoppages will be in effect along U.S. 2/7 between South Park Drive and Mountain View Drive. Each stoppage will last approximately 15 minutes.
  • The I-89 Exit 16 South off-ramp will be fully closed at night from 9 p.m. on Tuesday, July 28, through 6 a.m. on Wednesday, July 29.
  • The I-89 Exit 16 North off-ramp will be fully closed at night from 9 p.m. on Wednesday, July 29, through 6 a.m. on Thursday, July 30.
    • The ramps will be open during the daytime hours (6 a.m. to 9 p.m.).
    • Motorists traveling along I-89 seeking to exit the interstate at Exit 16, during each respective ramp closure, will be detoured to Exit 17 in Colchester. Motorists traveling southbound and motorists traveling northbound along I-89 seeking to exit the interstate at Exit 16 will be direct to take the Exit 17 South off-ramp and North off-ramp, respectively. At the Exit 17 interchange, motorists will be directed to travel east on U.S. Route 2 (U.S. 2) toward the Chimney Corner intersection of U.S. 2 and U.S. Route 2/7 (U.S. 2/7) before following U.S. 2/7 south toward the Exit 16 interchange. Supplemental Traffic Alerts will be issued prior to the overnight ramp closures.

Daily, starting the morning of Monday, July 27, through the afternoon of Friday, July 31, between 9 a.m. and 3 p.m. unless otherwise noted:

  • Single-lane closure on either side of U.S. 2/7 between South Park Drive and Mountain View Drive, with two-way traffic maintained.
  • Independent utility companies will be conducting work along U.S. 2/7 between South Park Drive and the I-89 South ramps under single-lane closures on either side of U.S. 2/7, with two-way traffic maintained.
  • Thursday, July 30, and Friday, July 31, single-lane closure on either side of U.S. 2/7 between Mountain View Drive and Hercules Drive, with two-way traffic maintained.

Motorists should slow down, use caution, and follow traffic control personnel's instructions and signage. In addition, motorists should expect significant delays when traveling through the work zone and along adjacent roadways. Please plan additional travel time or consider alternative routes.

CONSTRUCTION ACTIVITIES: Nighttime work this week will take place between 7 p.m. and 6 a.m., starting the evening of Sunday, July 26, through the morning of Friday, July 31. Crews will be installing overhead sign structures along U.S. 2/7 between South Park Drive and Mountain View Drive, and on the I-89 North and South off-ramps.

Daytime work will take place between 7 a.m. and 3 p.m., starting the morning of Monday, July 27, through the afternoon of Friday, July 31. Crews will prep sidewalks and install stamped concrete along either side of U.S. 2/7 between South Park Drive and Mountain View Drive. Thursday and Friday, crews will widen the roadway and clean up ditching along U.S. 2/7 between Mountain View Drive and Hercules Drive. Independent utility work will take place throughout the week, with Green Mountain Power on-site to relocate utility poles along either side of U.S. 2/7 between South Park Drive and the I-89 South ramps.

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Weekly Construction Update - Friday, July 17, 2026

DATE: Friday, July 17, 2026

TRAFFIC IMPACT AND DURATION:

Daily, starting the morning of Monday, July 20, through the afternoon of Friday, July 24, between 9 a.m. and 3 p.m. unless otherwise noted:

  • Outermost lane closures on either side of U.S. 2/7 between South Park Drive and Hercules Drive, with two-way traffic maintained.
  • Intermittent lane closures at the intersection of U.S. 2/7 and Hercules Drive, with traffic maintained in all directions. Flaggers will be present to assist motorists through the intersection as needed.

Motorists should slow down, use caution, and follow traffic control personnel's instructions and signage. In addition, motorists should expect significant delays when traveling through the work zone and along adjacent roadways. Please plan additional travel time or consider alternative routes.

CONSTRUCTION ACTIVITIES:

Daytime work will take place between 7 a.m. and 3 p.m., starting the morning of Monday, July 20, through the afternoon of Friday, July 24. Crews will install curb along both sides of U.S. 2/7 between South Park Drive and Mountain View Drive. Crews will conduct roadway widening along either side of U.S. 2/7 between Mountain View Drive and Hercules Drive and install traffic signal conduit along the west side (southbound). East Coast Signals will be onsite installing conduit and lighting, and conducting preparatory work for future traffic signal work at the intersection of U.S. 2/7 and Hercules Drive.

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Weekly Construction Update - Friday, July 10, 2026

DATE: Friday, July 10, 2026

TRAFFIC IMPACT AND DURATION:

Nightly, starting the evening of Sunday, July 12, through the morning of Tuesday, July 14, between 7 p.m. and 6 a.m., unless otherwise noted:

  • Lane closures along alternating sides of U.S. 2/7 between the Interstate 89 (I-89) overpass bridges and Mountain View Drive. Two-way traffic will be maintained with lane shifts.

Daily, starting the morning of Monday, July 13, through the afternoon of Friday, July 17, between 9 a.m. and 3 p.m. unless otherwise noted:

  • Thursday, July 16, and Friday, July 17, single-lane closure on either side of U.S. 2/7 between South Park Drive and Mountain View Drive, with two-way traffic maintained.
  • Independent utility companies will be conducting work along U.S. 2/7 between South Park Drive and the I-89 South ramps under single-lane closures on either side of U.S. 2/7, with two-way traffic maintained.
  • Single-lane closure on the west side of U.S. 2/7 starting at Mountain View Drive and continuing north, with two-way traffic maintained.
  • Intermittent lane closures at the intersections of U.S. 2/7 at the Exit 16 Interchange, Mountain View Drive, Hercules Drive, and Rathe Road, with two-way traffic maintained.
  • Independent work is being completed by the Town of Colchester at the intersection of U.S. 2/7 and Hercules Drive under possible lane closures with flaggers.

Motorists should slow down, use caution, and follow traffic control personnel's instructions and signage. In addition, motorists should expect significant delays when traveling through the work zone and along adjacent roadways. Please plan additional travel time or consider alternative routes.

CONSTRUCTION ACTIVITIES:

Nighttime work this week will take place between 7 p.m. and 6 a.m., starting the evening of Sunday, July 12, through the morning of Tuesday, July 14. On Sunday and Monday night, crews will pave a second lift of pavement along U.S. 2/7 between the I-89 overpass bridges and Mountain View Drive.

Daytime work will take place between 7 a.m. and 3 p.m., starting the morning of Monday, July 13, through the afternoon of Friday, July 17. Throughout the week, crews will begin roadway widening, installing conduit, and prepping sidewalk starting at Mountain View Drive working north. Later next week, curb installation is anticipated to take place along U.S. 2/7 between South Park Drive and Mountain View Drive. In addition, East Coast Signals will be onsite completing traffic signal work at signalized intersections throughout the project area. Independent utility work will take place throughout the week, with Green Mountain Power on-site to relocate utility poles along either side of U.S. 2/7 between South Park Drive and the I-89 South ramps. Additional independent work will be conducted by the Town of Colchester at the intersection of Hercules Drive and U.S. 2/7.  

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Traffic Alert - I-89 NB Off-Ramp Overnight Closure from 7/9 9PM to 7/10 6AM

Starting TONIGHT, Thursday, July 9, through the Morning of Friday, July 10, the Interstate 89 Exit 16 North Off-ramp will be Fully Closed

DATE ISSUED: Thursday, July 9, 2026

COLCHESTER, VT: From 9 PM tonight, Thursday, July 9, through 6 AM tomorrow, Friday, July 10, the I-89 Exit 16 North off-ramp will be closed for paving. Motorists traveling northbound along I-89 seeking to exit the interstate at Exit 16 will be detoured to Exit 17 in Colchester. At the Exit 17 interchange, motorists will be directed to travel east on U.S. Route 2 (U.S. 2) toward the Chimney Corner intersection of U.S. 2 and U.S. Route 2/7 (U.S. 2/7) before following U.S. 2/7 south toward the Exit 16 interchange. Signage and message boards will be posted near Exit 16 and along the detour route to guide motorists. Additionally, motorists may choose to seek alternative routes.

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Driving Animations

Experience Exit 16 DDI

Driving simulation traveling on US 2 West / 7 North through the DDI

Aerial view of the operating diverging diamond interchange at I-89 Exit 16

Driving simulation exiting I-89 onto US 2 East/7 South via Exit 16

Driving simulation traveling on US 2 East/7 South through the DDI

Driving simulation exiting I-89 onto US 2 West / 7 North via Exit 16