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Project Overview

Intersection of Routes 2/7 at Mountain View Road
Intersection of Routes 2/7 at Mountain View Road
Aerial rendering of the future Exit 16 Diverging Diamond Interchange
Aerial rendering of the future Exit 16 Diverging Diamond Interchange
Rendering of new Exit 16 DDI - Heading Northwest on US Route 2/7
Rendering of new Exit 16 DDI - Heading Northwest on US Route 2/7
Traffic begins to que at on I-89 off-ramp at Exit 16
Traffic begins to que at on I-89 off-ramp at Exit 16
With traffic diverted to the left side of the roadway, vehicles making a left onto the interstate do not have to cross oncoming traffic
With traffic diverted to the left side of the roadway, vehicles making a left onto the interstate do not have to cross oncoming traffic
With traffic diverted to the left side of the roadway, vehicles making a left onto the interstate do not have to cross oncoming traffic
With traffic diverted to the left side of the roadway, vehicles making a left onto the interstate do not have to cross oncoming traffic
The reduction of conflict points in DDIs reduces potential collisions, thus improving safety and vehicle throughput
The reduction of conflict points in DDIs reduces potential collisions, thus improving safety and vehicle throughput
The DDI's channelizing raised islands reduce significantly the number of wrong-way entrances onto the interstate
The DDI's channelizing raised islands reduce significantly the number of wrong-way entrances onto the interstate
The Exit 16 DDI Project will modernize traffic signals along US Route 2/7 at local road intersections, reducing traffic backup
The Exit 16 DDI Project will modernize traffic signals along US Route 2/7 at local road intersections, reducing traffic backup
With left turn movements operating freely with the DDI, the traffic signals no longer require dedicated left turn phasing, improving overall traffic operations at the interchange
With left turn movements operating freely with the DDI, the traffic signals no longer require dedicated left turn phasing, improving overall traffic operations at the interchange
The Exit 16 DDI Project will modernize traffic signals along US Route 2/7 at local road intersections, reducing traffic backup
The Exit 16 DDI Project will modernize traffic signals along US Route 2/7 at local road intersections, reducing traffic backup
With left turn movements operating freely with the DDI, the traffic signals no longer require dedicated left turn phasing, improving overall traffic operations at the interchange
With left turn movements operating freely with the DDI, the traffic signals no longer require dedicated left turn phasing, improving overall traffic operations at the interchange
The Exit 16 DDI Project will modernize traffic signals along US Route 2/7 at local road intersections, reducing traffic backup
The Exit 16 DDI Project will modernize traffic signals along US Route 2/7 at local road intersections, reducing traffic backup
Aerial rendering of the future Exit 16 Diverging Diamond Interchange
Aerial rendering of the future Exit 16 Diverging Diamond Interchange
With left turn movements operating freely with the DDI, the traffic signals no longer require dedicated left turn phasing, improving overall traffic operations at the interchange
With left turn movements operating freely with the DDI, the traffic signals no longer require dedicated left turn phasing, improving overall traffic operations at the interchange

The Vermont Agency of Transportation (VTrans) is improving the roadway along the US Routes 2/7 corridor, in the vicinity of I-89 Exit 16, to enhance mobility and safety in Colchester, Vermont. The project area extends from in the Colchester-Winooski town line north for approximately 1 mile to just beyond the intersection of Sunderland Woods Road at US Route 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. Other improvements include:

The current interchange at Exit 16 is a grade separated tight diamond interchange with Interstate 89 crossing over US Routes 2/7 via two bridges. The existing interchange yields frequent traffic congestion, lengthy delays, and significant queuing during peak hours. These existing conditions are a safety concern with a high number of incidents, collisions and a lack of accommodations for non-motorized travel.

The project is estimated to cost approximately $10 million and is scheduled to be advertised for contractor bid in fall of 2019 with contract award in winter of 2020. Construction is anticipated to begin in Spring 2020 and be completed over the course of two full construction seasons, ending in Spring 2022. The first year of construction will consist mainly of utility relocation, ledge removal, and drainage work with the bulk of the roadway construction including the installation of the DDI, the addition of the turning lanes, and the implementation of the pedestrian and bicycle accommodations taking place the following construction season.

Prior to and throughout construction, educational materials will be provided at the Town offices and distributed at local community events in the greater Colchester area to prepare the traveling public for changes in traffic patterns resulting from the construction of the DDI. Educational materials can also be found on this website in the Document Library.

VTrans’ comprehensive communications and public outreach program will keep the public informed throughout the life of the project and beyond as drivers learn to navigate the new interchange.

This website provides up-to-date project information. Additional sources of information include:

Project Milestones

September 28, 2012

  • Preliminary Plans

November 28, 2016

  • Permitting

Q4 2019

  • Right-of-Way Clear

Q1 2020

  • Bid Advertisement

Q2 2020

  • Contract Award

Q2 2020 to Q3 2022

  • Target Construction Schedule