Beginning in the city of New Bedford, it runs as a freeway for approximately 2 miles (3.2 km), continuing as a surface street until it reaches Weymouth.

At all lights north of Bridgewater center, the road widens to four lanes temporarily, before and after the intersection.

While this helps alleviate backups at the lights and assists vehicles turning left off of the route, it creates bottlenecks after the intersection, where the two lanes re-merge into one.

The $26 million project was originally planned to begin in 2013 but had yet to break ground as of July 2014.

The project was substantially completed in late 2022 with the dedication of the rebuilt bridge over the MBTA Commuter Rail honoring fallen Weymouth Police officer, Michael C. Chesna.