Massachusetts Route 18 is a 41.561-mile-long (66.886 km) north–south state highway in Southeastern Massachusetts. 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. The segment of Route 18 from its southern terminus to I-195 is part of the John F. Kennedy Memorial Highway, a state-maintained road that extends an additional 1.5 miles (2.4 km) south without the Route 18 designation.