Interstate 93 — LLMpedia

Interstate 93
State	MA
State1	NH
State2	VT
Route	93
Length mi	189.95
Established	1957
Direction a	South
Terminus a	Interstate 95 / Route 128 in Canton, MA
Junction	* I-90 / Massachusetts Turnpike in Boston * US 1 in Boston * I-95 / NH 101 in Manchester, NH * I-293 / NH 101 in Manchester, NH * I-89 in Bow, NH * US 3 in Franconia Notch State Park, NH
Direction b	North
Terminus b	US 2 in St. Johnsbury, VT
Counties	Norfolk, Suffolk, Middlesex, Essex (MA), Hillsborough, Merrimack, Grafton, Coos (NH), Caledonia (VT)

Contents

Interstate 93 is a major north–south Interstate Highway in the New England region of the United States. It spans approximately 190 miles from its southern terminus at Interstate 95 in Canton, Massachusetts, to its northern terminus at U.S. Route 2 in St. Johnsbury, Vermont. The highway serves as a critical transportation artery for the Greater Boston metropolitan area and provides the primary route through the White Mountains of New Hampshire.

Route description

Beginning at a massive interchange with Interstate 95 and Route 128 south of Boston, it heads north through the densely populated suburbs of Braintree and Quincy. It enters the city of Boston as the Central Artery, a depressed highway running through the heart of the city, and passes near landmarks like Boston City Hall and Faneuil Hall. North of Boston, it travels through the cities of Medford and Andover before crossing into New Hampshire near Salem. In New Hampshire, it serves the state's largest city, Manchester, and the capital, Concord. The route then traverses the scenic Franconia Notch State Park in the White Mountain National Forest before crossing into Vermont and terminating at U.S. Route 2.

The route's numbering was approved as part of the federal Interstate Highway System in 1957. In Massachusetts, much of its initial construction in the 1950s and 1960s involved building the elevated Central Artery through Boston, a project that became infamous for traffic congestion. This led to the monumental Big Dig project, officially the Central Artery/Tunnel Project, which rerouted the highway into a tunnel and created the Zakim Bunker Hill Bridge over the Charles River. In New Hampshire, construction through the environmentally sensitive Franconia Notch was a subject of prolonged debate, resulting in a unique parkway design within Franconia Notch State Park. The final segment connecting to Interstate 91 in St. Johnsbury, Vermont, was completed in 1982.

From south to north, key junctions include its southern terminus at Interstate 95 in Canton. In Boston, major interchanges exist with Interstate 90 (the Massachusetts Turnpike) and U.S. Route 1. In New Hampshire, it intersects with Interstate 293 and NH 101 in Manchester, meets Interstate 89 south of Concord, and has a junction with U.S. Route 3 in Franconia Notch State Park. Its northern terminus is at U.S. Route 2 in St. Johnsbury, Vermont.

A comprehensive exit list begins with Exit 1 in Canton for Ded and proceeds northward. Notable exits include those for Route 3 and Route 24 in Braintree, the complex series of exits serving downtown Boston and Logan International Airport, and exits for University of Massachusetts Lowell and Manchester–Boston Regional Airport. In New Hampshire, key exits serve New Hampshire State Prison, the New Hampshire State House, and attractions like Cannon Mountain and The Flume Gorge in Franconia Notch State Park. The final exit in Vermont provides access to Interstate 91.

has two primary auxiliary routes. Interstate 293 forms a loop through Manchester and Hooksett, connecting back to it. Interstate 393 is a short spur east from Concord toward Loudon. In Massachusetts, Interstate 95 and Route 128 share a concurrency with its southern terminus, but no dedicated three-digit spur routes branch from it within the state.