The state Department of Transportation is proposing to build $12.5 million of roundabouts at the Exit 89 interchange of Interstate 95 which it says will make for a smoother traffic flow at the Allyn Street exit, decrease backups, reduce speed and help prevent wrong-way driving. The DOT is proposing single-lane roundabouts at three intersections: the I-95 southbound on and off ramps; the I-95 northbound on and off ramps; and the Allyn Street and Sandy Hollow Road intersection. Scott Bushee, principal engineer of the state highway design unit and chairman of the DOT’s roundabout committee, said the traffic circles have fewer “conflict points” in which vehicles could collide. A conventional intersection has 32 conflict points, compared to eight with a roundabout. The roundabout project would cost $12.5 million, while an alternative for signalized intersections would cost $6.4 million, according to the DOT. The project is slated to be paid for with 80% federal funds and 20% state funds.
https://theday.com/news/753396/roundabouts-proposed-for-exit-89-interchange-of-i-95-in-groton/