US_3_TN

U.S. Route 3 (US 3) is a United States highway running 277.9 miles (447.2 km) from Boston, Massachusetts, through New Hampshire, to the Canada–US border near Third Connecticut Lake, where it connects to Quebec Route 257.

Massachusetts Route 3 connects to the southern terminus of US 3 in Cambridge and continues south to Cape Cod. Though it shares a number, it has never been part of US 3. Both routes, which connect end-to-end, are treated as a single 91.3-mile (146.9 km) state highway by the MassDOT. From Boston to Burlington, U.S. 3 is routed on surface streets through the dense suburbs in the Greater Boston area. After a brief concurrency with the Massachusetts Route 128 freeway, the route follows its own freeway northwest, bypassing Lowell and entering New Hampshire at Nashua.

In New Hampshire, current and former parts of US 3 are known as the Daniel Webster Highway. From Burlington, Massachusetts, to Nashua, New Hampshire, US 3 is a freeway. The segment in New Hampshire is a free portion of the Everett Turnpike, while the portion in Massachusetts is known as the Northwest Expressway. From where it leaves the Everett Turnpike in Nashua northwards, US 3 is generally a 2-4 lane at-grade road, though there are two super two freeway portions in northern New Hampshire, one on the Laconia Bypass, and one where US 3 and Interstate 93 use the Franconia Notch Parkway. The route serves as a major local arterial, connecting many of the cities of the densely populated Merrimack River Valley. North of the White Mountains, the route serves as one of the only north-south roads connecting the communities of the Great North Woods Region and has New Hampshire's only border crossing between the US and Canada.
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