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, August 7, 2026

DATE: Friday, August 7, 2026

TRAFFIC IMPACT AND DURATION: Nightly, starting the evening of Sunday, August 9, through the morning of Tuesday, August 11, between 9 p.m. and 6 a.m., unless otherwise noted:

  • Single lane closures will be in effect along Mountain View Drive and Lower Mountain View Drive near their intersection with U.S. 2/7. Two-way traffic will be maintained through traffic shifts and alternating one-way traffic controlled by flaggers.

Daily, starting the morning of Monday, August 10, through the afternoon of Friday, August 14, 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 Mountain View Drive. Two-way traffic will be maintained.
  • Single lane closure on alternating sides of U.S. 2/7 between Hercules Drive and Rather Road. Two-way traffic will be maintained.
  • Intermittent single lane closures at the signalized intersections of U.S. 2/7 at Tigan Street, South Park Drive, the Exit 16 Interchange, Mountain View Drive, Hercules Drive, and Rathe Road. Two-way traffic will be maintained through traffic shifts and alternating one-way traffic controlled by 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, August 9, through the morning of Tuesday, August 11. Crews will be milling and paving Mountain View Drive and Lower Mountain View Drive near the intersection with U.S. 2/7 and within the project limits.

Daytime work will take place between 7 a.m. and 3 p.m., starting the morning of Monday, August 10, through the afternoon of Friday, August 14. Crews will continue prepping and pouring sidewalk and installing curb along both sides of U.S. 2/7 between South Park Drive and Mountain View Drive. Crews will conduct repairs on the Interstate 89 overpass bridges. Crews will continue widening U.S. 2/7 between Hercules Drive and Rathe Road. Crews will be working to upgrade traffic signals at the intersections of U.S. 2/7 at Tigan Street, South Park Drive, the Exit 16 Interchange, Mountain View Drive, Hercules Drive, and Rathe Road intermittently throughout the week.

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Weekly Construction Update - Friday, July 31, 2026

DATE: Friday, July 31, 2026 

TRAFFIC IMPACT AND DURATION: Nightly, starting the evening of Sunday, August 2, through the morning of Friday, August 7, between 7 p.m. and 6 a.m.: 

  • Lane closures on U.S. 2/7 under the Interstate 89 (I-89) overpass bridges, with two-way traffic maintained under lane shifts.  
  • Single-lane closure on I-89 North and South in the vicinity of the Exit 16 interchange, with a lane shift and traffic maintained in one travel lane in each direction.  

Daily, starting the morning of Monday, August 3, through the afternoon of Friday, August 7, between 9 a.m. and 3 p.m.: 

  • Outside lane closures will be in place in both directions on U.S. 2/7 between South Park Drive and Mountain View Drive. Two-way traffic will be maintained. 
  • Single-lane closures on U.S. 2/7 near the Hercules Drive intersection, 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, August 2, through the morning of Friday, August 7. Crews will install bridge-mounted signs on the I-89 overpass above U.S. 2/7. 

Daytime work will take place between 7 a.m. and 3 p.m., starting the morning of Monday, August 3, through the afternoon of Friday, August 7. Crews will continue to prep sidewalks along either side of U.S. 2/7 between South Park Drive and Mountain View Drive, and conduct bridge pier rehabilitation under the I-89 overpass bridges. In addition, crews will continue widening the roadway along U.S. 2/7 near Hercules Drive. 

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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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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