Massachusetts Launches Construction of First Diverging Diamond Interchange in Natick
Preliminary work has begun in Natick, a Boston suburb, marking the start of a major infrastructure project to build Massachusetts’ first diverging diamond interchange. Valued at $99.2 million, this project aims to improve traffic safety and connect communities better.
Project Overview
| Aspect | Details |
|---|---|
| Location | Natick, Massachusetts |
| Client | Massachusetts Department of Transportation (MassDOT) |
| Project Value | $99.2 million |
| Scope | Bridge replacement, traffic flow improvement, pedestrian and bicycle facilities |
| Roads Involved | Routes 27 and 9 |
| Project Length | About 3,600 feet along Route 9 |
| Expected Completion | Mid-2030 |
Why a Diverging Diamond Interchange?
A diverging diamond interchange (DDI) is a smart design that improves traffic safety by briefly shifting vehicles to the other side of the road at the interchange. The diverging design reduces left-turn conflicts across oncoming traffic and lowers crashes by up to 50%. The DDI also helps traffic move smoother, cuts wait times, and offers safer paths for walkers and cyclists with dedicated lanes.
Technical Upgrades and Features
| Feature | Description |
|---|---|
| Bridge Replacement | Replaces the old Route 27 bridge over Route 9 with two strong, single-span bridges, improving traffic flow and durability. |
| Pedestrian and Bicycle Paths | Builds a safe shared-use path bridge for pedestrians and cyclists, encouraging active and safe travel through the diverging diamond interchange. |
| Drainage System Improvements | Updates the drainage along Route 9 to better handle stormwater and prevent flooding. |
| Median Barrier Replacement | Installs new median barriers to prevent vehicles from crossing into opposite lanes. |
| Traffic Monitoring Technology | Uses Jacobs’ StreetLight system to watch traffic in real time, helping reduce construction delays and improve safety. |
| Connectivity Enhancements | Links paths to schools, transit stops, and workplaces, making it easier for people to get around without cars. |
Project Impact and Benefits
This interchange design cuts down vehicle crashes, especially those from left turns crossing traffic. Traffic will flow more smoothly, reducing delays during busy times. New walking and biking paths will make travel safer and encourage healthier, greener ways to get around.
Jacobs and McCourt Construction, with their experience building in the diverging diamond interchange style, ensure the interchange is built safely, efficiently, and with the community in mind. The smart use of traffic data will keep disruptions low during construction.
Engineering and Materials
The project uses strong and weather-resistant materials like reinforced concrete and steel to build bridges that last long and handle heavy traffic. These materials stand up well to cold winters and road salt. The paths for walkers and cyclists have safe surfaces and railings. Drainage systems are updated to handle rain better and protect the roads and nearby areas.
During construction, the team will test materials and structures regularly to make sure everything is safe and built to last. This careful work will mean fewer repairs and less traffic trouble in the future. The quality materials will ensure longevity for the diverging diamond interchange.
Looking Ahead
This project shows how Massachusetts is committed to building safer and smarter roads for everyone. By combining good design with smart traffic monitoring, the new interchange will make travel in Natick safer and easier. When finished, the diverging diamond interchange will offer smoother drives by mid-2030 and better options for walking and biking. This is more than just a road project; it’s a step toward stronger communities and cleaner transportation.
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