Interstate 93

Interstate 93
Route information
Length:	189.95 mi[1] (305.69 km)
Existed:	1957 – present
Major junctions
South end:	I-95 / US 1 / Route 128 in Canton, MA
	I-90 / Mass. Pike in Boston, MA I-95 / Route 128 in Reading, MA I-495 in Andover, MA I-293 / NH 101 in Manchester, NH I-293 / Everett Tpke. in Hooksett, NH I-89 in Bow, NH I-393 / US 4 / US 202 in Concord, NH
North end:	I-91 in St. Johnsbury, VT
Highway system
Main route of the Interstate Highway System Main • Auxiliary • Business

Interstate 93 (abbreviated I-93) is an Interstate Highway in the New England section of the United States. Its southern terminus is in Canton, Massachusetts, in the Boston metropolitan area, at Interstate 95;^[2] its northern terminus is near St. Johnsbury, Vermont, at Interstate 91.^[3] It is one of three mainline Interstate highways whose entire route is located within the New England states, the other two being I-89 and I-91. The largest cities along its route are Manchester, New Hampshire, Concord, New Hampshire and Boston, Massachusetts.

For most of its length, Interstate 93 indirectly parallels U.S. Route 3. Particularly in New Hampshire, the two highways have several interchanges with each other, as well as a concurrency through Franconia Notch State Park.

Route description

Lengths

	mi[4][5][6]	km
MA	46.19	74.33
NH	131.39	211.45
VT	11.10	17.86
Total	188.68	303.65

Massachusetts

Interstate 93 begins in the south at exit 12 of I-95 in Canton. I-93 begins co-signed with U.S. Route 1 North. At this junction, I-95 North heads to the northwest (co-signed with U.S. Route 1 South, as well as Route 128, which begins at the interchange), to serve as the beltway around Boston, while I-95 South runs by itself southwest through Boston's southwestern suburbs toward Rhode Island.

The first few miles of I-93 run east through Boston's southern suburbs, passing through Canton and Randolph. In Randolph, I-93 meets the northern end of Route 24 (Fall River Expressway/AMVETS Memorial Highway) at Exit 4. I-93 continues east into Braintree, interchanging with Route 3, the major freeway linking Boston to Cape Cod, at Exit 7 (known locally as the "Braintree Split"). Route 3 North joins I-93 and US-1, and the highway turns north toward Boston.

Signs in the Financial District of Boston point toward Downtown Crossing, Chinatown, Interstate 93, and Interstate 90.

Upon turning northward, the highway is known as the Southeast Expressway through Quincy, Milton and Boston's Dorchester section. After the Massachusetts Avenue connector exit, the highway officially becomes the John F. Fitzgerald Expressway, which is also known as the Central Artery, and passes beneath downtown Boston. A major intersection with the Massachusetts Turnpike/Interstate 90 (Exit 20) takes place just south of downtown Boston. After the massive interchange, motorists use the Thomas P. O'Neill Jr. Tunnel to travel underneath the city and then use Zakim Bunker Hill Bridge to cross the Charles River. Two exits are located in the tunnel, where the speed limit is 45 miles (72 km) an hour. Route 3 leaves the Artery just before the Zakim bridge via Exit 26, and U.S. Route 1 leaves the Artery just after the bridge, via Exit 27 (no southbound access). From Boston through the rest of Massachusetts, Concord, NH appears as the control city on northbound overhead signs. The Artery ends as I-93 continues north out of the city.

I-93 continues through the northern suburbs of Boston, coming to a second intersection in Woburn with Interstate 95, and Route 128, which runs congruent. Travelers going north can either change over to I-95 north to eventually reach Maine, or remain on I-93 toward New Hampshire. Farther north, in Andover, I-93 meets I-495, providing access to Worcester to the southwest and New Hampshire's seacoast region to the northeast. Just south of the state line, I-93 crosses the Merrimack River into Methuen, where it interchanges with Route 213, a connector between I-93 and I-495. I-93 then crosses into New Hampshire.

In all, I-93 has 48 numbered exits in Massachusetts, although several numbers are skipped in and near Boston. One noteworthy reason that some exits were removed from I-93 is to further address traffic problems in addition to converting the Central Artery from six to eight to ten lanes, by reducing the combined number of on- and off-ramps from 27 to 14.^[7] Exit 48 in Methuen, just before the New Hampshire state line, is the highest-numbered exit along the entire route. Due to the highway being one of the two major Interstates that enter Boston directly (Interstate 90 is the other), nearly the entire length of the highway in Massachusetts carries four lanes in each direction. Average daily traffic volumes on I-93 in the state range from 100,000 vehicles at the New Hampshire border^[8] and 150,000 vehicles at the southern end at I-95^[9] to over 200,000 vehicles through Braintree and Quincy.^[8]

New Hampshire

Interstate 93 travels just over 131 miles (211 km) in the Granite State; around two-thirds of the highway's total distance. Serving as the main interstate route in New Hampshire, it connects the state capital, Concord, and its largest city, Manchester. Beyond Concord are the towns of Tilton, Plymouth, and Littleton. I-93 is known as the Alan B. Shepard Highway from the Massachusetts line to Hooksett (just north of Manchester), as the F.E. Everett Turnpike from Hooksett to Concord, and as the Styles Bridges Highway from Concord to the Vermont line.

Between the northern end of I-293 in Hooksett and the beginning of I-89 in Bow, I-93 also carries the northern end of the Everett Turnpike. There is one toll booth along this section, at Exit 11 in Hooksett; toll for passenger cars is currently $1 (50¢ at the ramp toll booth). This is the only toll collected along the entire length of Interstate 93. I-93 in New Hampshire is also notable for having state liquor stores serve as rest areas, which are passed just after the toll plaza, traveling north. There are separate stores on both sides of the Interstate for travelers in each direction.

I-93 enters New Hampshire at Salem, where the current reconstruction of the Exit 1 ramps (leading to the Mall at Rockingham Park) along with the reduction of the freeway from 4 northbound lanes to only 2 tends to cause traffic backups. A rest area/welcome center is available on the northbound side of the freeway, directly before Exit 1. I-93 remains only two lanes wide in each direction for its first 18 miles (29 km), until the split with Interstate 293 and the junction with New Hampshire Route 101 add a third and fourth lane back to the freeway. I-93 and New Hampshire Route 101 run concurrently for about a mile before New Hampshire Route 101 heads directly east as its own freeway, serving Portsmouth and the Seacoast region. I-93 keeps three lanes of traffic in each direction until the junction with Interstate 89, when each side reduces back to two, and remains a four-lane freeway through most of its journey northward, with the only exception being the Franconia Notch section.

Northbound lane of Interstate 93/US Route 3 in Franconia Notch

It crosses the Merrimack River again before going through the state capital of Concord. In Concord, Interstate 393 heads directly east (co-signed with eastbound U.S. Route 4 and U.S. Route 202), providing another route to the Seacoast region. Westbound U.S. Route 4 joins I-93 and runs concurrently with it until Exit 17 for Penacook, about 5 miles (8.0 km) further north, before exiting westward. Continuing north, I-93 traverses the Lake Winnipesaukee tourist region and makes its way north through the heart of the White Mountains Region. I-93 passes through Franconia Notch State Park as a Super-2 parkway. This stretch carries a 45-mile-per-hour speed limit. For the trip through Franconia Notch, I-93 and U.S. Route 3 run concurrently.

Beyond Franconia Notch State Park, U.S. 3 heads northeastward through the Great North Woods region, while I-93 runs to the northwest. The final town along I-93 in New Hampshire is Littleton, served by three exits. Many motorist services are available at Exit 42. After passing through town, it crosses the Connecticut River into Vermont. The last exit along I-93 is exit 44 for Monroe, through which a rest area/welcome center is accessible to travelers on both sides of the highway.

Vermont

Southbound I-93 at Hudson Road, St. Johnsbury, VT

Interstate 93 runs for only 11 miles (18 km) in Vermont, with only one numbered exit in the state before ending at the interchange with Interstate 91 in St. Johnsbury. A rest area/welcome center is located along the northbound side of the highway for travelers entering from New Hampshire. The final few miles of the Interstate, just before its terminus, actually veer to the southwest. Vehicles bound for Canada can use northbound I-91 to reach the Quebec border crossing at that Interstate's end. The portion of I-93 in Vermont parallels both U.S. Route 2 and Vermont Route 18.

History

Southeast Expressway

Main article: Southeast Expressway (Massachusetts)

The Southeast Expressway in and near Boston was constructed between 1954 and 1959, at the same time the Fitzgerald Expressway (Central Artery) was built. It begins at the Braintree Split and ends at the Thomas P. O'Neill Jr. Tunnel. A section of the Expressway, beginning south of the Savin Hill overpass and ending just before the junction with Route 3, utilizes a zipper lane, in which a movable barrier carves out a reversible high occupancy vehicle lane on the non-peak side of the highway during rush hour.

Boston

Further information: John F. Fitzgerald Expressway and Big Dig

Route of the original Central Artery, as well as other roadways affected by the Big Dig.

Route of the New Central Artery after the Big Dig

Interstate 93 through the O'Neill Tunnel

The South Bay interchange (looking south) to the Southeast Expressway with Great Blue Hill visible in the background

The Central Artery, officially the John F. Fitzgerald Expressway, was a section of highway in downtown Boston constructed in the 1950s and was originally designed as a fully elevated highway. This new highway was greatly disliked by the citizens of the city because it cut the heart of the city in half, cast long, dreary shadows and was an eyesore to the community. Because of the public outcry, Gov. John Volpe ordered the southern half of the highway redesigned so that it was underground; this section became known as the Dewey Square Tunnel. With the cancellation of the highway projects leading into the city in 1972 by Gov. Francis W. Sargent, the Central Artery gained the designation of Interstate 93 in 1974. It has also carried the local highway designations of U.S. 1 (since 1989) and Route 3.

By the mid-1970s, I-93 had outgrown its capacity and had begun to deteriorate due a lack of maintenance. State Transportation Secretary Frederick P. Salvucci, aware of the issues surrounding the elevated roadway, proposed a plan conceived in the early 1970s by the Boston Transportation Planning Review to replace the rusting elevated six-lane Central Artery with a new, more efficient underground roadway. This plan was merged with a long-standing proposal to build a third harbor tunnel to alleviate congestion in the Sumner and Callahan tunnels to East Boston; the new plan became known as the Central Artery/Tunnel Project or the Big Dig.

These new roadways were built during a twelve-year period from 1994 to early 2006. The massive project became the largest urban construction project ever undertaken in American history.^[10] Construction on the new I-93 segment was not without serious issues: a lengthly Federal environmental review pushed the start of construction back from approximately 1990, causing many inflationary increases; funding for the project was the subject of several political battles between Pres. Ronald Reagan and Rep. Thomas P. O'Neill, Jr. Major construction on the new roadway was done while maintaining the old roadway, a step that also greatly increased the cost of the project. The original Charles River crossing, named Scheme Z, was the object to great public outcry similar to that of the building of the original highway. The outcry eventually led to the replacement of Scheme Z with a newer, more sleek cable-stayed bridge and complementing exit for Cambridge, increasing the cost even more.

In Downtown Boston, I-93 is now made up of the Thomas P. O'Neill Jr. Tunnel and the Zakim Bunker Hill Bridge, which spans the Charles River. The underground construction of the tunnel system was completed as of October, 2006; however, repairs continue to many parts of the tunnel due to water leakage because of improper construction of the slurry walls supporting the O'Neill tunnel. The former route of the above-ground Artery, so named "the other Green Monster" by Mayor Thomas Menino, was replaced mostly by open space known formally as the Rose Kennedy Greenway.

Additional improvements were done in the South Bay section of the highway: The I-90/I-93 interchange was completely redesigned, a new HOV lane extending from the zipper lane in Quincy was added and the South Boston Haul road that was constructed to bypass truck traffic around residential streets in the South End is now open to general traffic.

Hazardous cargoes are now prohibited from I-93 in Boston due to safety issues in the tunnels; these cargoes must now exit at either the Leverett Circle connector in Cambridge when traveling southbound or at the Massachusetts Ave. exit when traveling northbound.

See also: Massachusetts Turnpike, John F. Fitzgerald, Rose Kennedy, Leonard P. Zakim, and Bunker Hill Monument

Northern Expressway

Main article: Northern Expressway (Massachusetts)

The Northern Expressway was constructed from Medford to the New Hampshire border between 1956 and 1963. It was extended through Somerville and Charlestown to the Central Artery, U.S. Route 1, and the planned route of the Inner Belt between 1965 and 1973. Because it was already under construction, the highway was granted an exception to the moratorium on highway expansion inside Route 128 which was announced in 1970.^[11]

New Hampshire

Originally planned to follow the alignment of US 3 through Nashua along the Everett Turnpike, this was changed before construction to the current route through Salem largely due to the intervention of the owners of Rockingham Park.^{[citation needed]} Exit 1 in Salem was originally designed and built with ramps allowing northbound traffic to exit to the race track and return drivers to southbound 93 only. The complementary ramps were added much later, with the southbound off ramp being a particularly tight and dangerous turn squeezed within the curve of the southbound on ramp.

An 8-mile (13 km) section of I-93 through Franconia Notch State Park, called the Franconia Notch Parkway in New Hampshire, was constructed as a two-lane freeway with a median divider. This was built as a compromise between the state's park department and highway officials. The speed limit on the Parkway is 45 mph (70 km/h). Originally, this section's signage read "U.S. 3 TO I-93" in this area complete with its own exit number sequence, but this has since been replaced by I-93 and US-3 signage along the entire length of the Parkway. The exits were renumbered to Exit 34A, 34B, and 34C.

A 59-vehicle accident briefly closed the turnpike near Derry, Exit 4, on January 11, 2009. A bus had tried to avoid a car going out of control. There were no major injuries.^[12] A 12-vehicle accident occurred the following Sunday, January 18, near the previous week's accident. The pair of accidents has led proponents of widening the highway to urge that there be no more delays in the project.^[13]

Vermont

Construction of Interstate 93 was completed in 1983 in Vermont. It was the last interstate to be built in the state.

Future expansion

Massachusetts plans

Since 1996, MassHighway has studied rebuilding the intersection of I-93 and I-95 in Woburn along the border with Stoneham and Reading.^[14] The project is expected to start in 2017 and cost $267 million.^[15]

The Massachusetts Department of Transportation and its predecessor MassHighway have planned on widening I-93 to a uniform four travel lanes in both directions from the current lane drop near Exit 41 in Wilmington to the New Hampshire border since the beginning of the 2000s.^[16] The first section of widening will be done as part of the I-93 Tri-Town Interchange Project. The project will construct a new interchange in Wilmington. I-93 will be widened from 3 to 4 lanes from Exit 41 to I-495, a distance of approximately 5 miles (8 km), as the first phase in widening I-93 from Exit 41 to the New Hampshire state line. Early estimates of the entire project place the cost at $567 million.^[17]

Rapid bridge replacement project

In September 2010, a section of a bridge in Medford when a 25-by-7-foot (7.6 × 2.1 m) section of bridge deck on the northbound side partially collapsed due to age-related structural fatigue.^[18] The collapse forced the Massachusetts Department of Transportation to evaluate the remaining bridges along the corridor, eventually deciding to replace several bridges along the highway in a plan called 93 Fast 14. MassDOT set in motion a plan to replace the superstructure and concrete decks on 14 overpass bridges along that section of the interstate. The $98.1 million project replaced bridges originally built in 1957 with a set of prefabricated modular concrete bridges in a series of weekend roadway closures. Traffic was diverted into a series of crossover lanes during construction. The main part of the project took place each weekend from June through August 2011,with the exception of the July 4th holiday weekend. One or two bridges were replaced each weekend during the construction time frame. The project was part of the Commonwealth's Accelerated Bridge Program.^[19][20]

New Hampshire plans

Initial plans to widen I-93 to a uniform four travel lanes in both directions from Salem to Manchester beginning in 2008 were put on hold due to a lawsuit designed to force the NH Department of Transportation to update the plans to include other transportation options. Under orders from US District Court, the NHDOT and US Department of Transportation must provide an updated environmental review. The Conservation Law Foundation (CLF) filed a lawsuit in February 2006, hoping to force any expansion plans in the area to include the restoration of commuter rail service between Manchester and Boston.^[21] Despite the suit, the Exit 1 interchange construction was allowed to undergo upgrading and expansion; other associated projects related to the widening, chiefly around Exits 3 and 5, were also eventually allowed to proceed. The whole set of projects were eventually allowed to move forward when an agreement between the state and the CLF that removed the group's opposition to construction which does not pose a threat to the environment.^[22]

As part of the 2009 stimulus package, New Hampshire is set to receive several million dollars in highway construction funds. One of the projects will be widening a portion of the highway between the Massachusetts border and Manchester. Bidding is set to begin in February 2009 with construction slated to begin in late 2009 or early 2010.^[23] The plans call for the New Hampshire Department of Transportation to widen the southernmost 20 miles (32 km) of I-93 to four lanes in each direction, from the current two. In addition, all five interchanges along this length will be upgraded to accommodate larger amounts of traffic, including replacing many aging bridges. Smaller construction projects at some of the interchanges are already taking place.^[22] According to plans filed by the state with US DOT, the project is scheduled to run from 2009 through 2016, with work starting at the Massachusetts line and moving northward to Manchester. The project is designed with an intermodal transit bent; new or improved park and ride facilities deployed at exits 1, 3 and 5 and a widened median strip that is designed to accommodate a planned commuter rail service between Boston and Manchester.^[24]

As a way to help defray the costs of the expansion, in early 2010 the NHDOT made a formal request to the Federal Highway Administration to add tolls to I-93 at the Massachusetts-New Hampshire border. The new toll facility was to be located in Salem, New Hampshire, approximately .5 mi (0.80 km) from the state line, and would cost travelers $2 per car. The proposal faced opposition from state legislators in both states who claimed the tolls would cause severe congestion in the area and lead to an economic burden to local residents. Opponents included US senator Scott Brown (R-Massachusetts).^[25] The proposal was eventually dropped in favor of issuing new state bonds to pay for expansion. The new policy was laid out by Transportation Commissioner George Campbell after reviewing the proposal and receiving a promise from the MassDOT that it would not be enacting a similar toll on the Massachusetts side of the border.^[26]

Exit list

Exits 17, 19, 21 & 25 were eliminated as part of the Big Dig.

County	Location[27]	Mile	#	Destinations	Notes
Norfolk	Canton	0.00[28]		I-95 north / US 1 south / Route 128 north – Dedham, Portsmouth	I-93's southern terminus and southern end of US 1 concurrency. The mainline of I-93 South defaults onto I-95 North. US 1 South continues concurrent with I-95 North and Route 128 North begins at this interchange.
		0.24	1	I-95 south - Providence	Southbound exit and northbound entrance
		1.41	2A-B	Route 138 – Stoughton, Milton
	Milton	2.59	3	Ponkapoag Trail - Houghton's Pond
	Randolph	3.45	4	Route 24 south – Brockton, Fall River	Fall River Expressway/Amvets Highway
		4.22	5A-B	Route 28 – Randolph, Milton
	Braintree	6.43	6	Route 37 – West Quincy, Braintree, Holbrook
		7.07	7	Route 3 south – Braintree, Cape Cod	Route 3 enters northbound and exits southbound
	Quincy	8.20	8	Furnace Brook Parkway - Quincy
	Milton	9.31	9	Bryant Avenue - West Quincy	Southbound exit and northbound entrance
		9.38	9	Adams Street - Milton, North Quincy	Northbound exit and southbound entrance
		9.59	10	Squantum Street - Milton	Southbound exit only
		10.84	11A	Granite Avenue - East Milton	Southbound exit and northbound entrance
		10.84	11B	To Route 203 / Granite Avenue – Ashmont	Signed as exit 11 northbound; no northbound entrance
Suffolk	Boston	11.72	12	Route 3A south – Neponset, Quincy	Southbound exit and northbound entrance
		12.61	13	Freeport Street - Dorchester	Northbound exit and southbound entrance
		12.84	14	Morrissey Boulevard - JFK Library	Northbound exit and southbound entrance
		14.36	15	Columbia Road - Edward Everett Square, JFK Library
		15.08	16	Southampton Street - Andrew Square	Northbound exit and southbound entrance
		15.49	18	Frontage Road, Massachusetts Avenue - Roxbury, Andrew Square
		16.31	20	I-90 – Logan Airport, Worcester	Northbound exit and southbound entrance
			20B	I-90 west (Mass Pike) / Albany Street	Southbound exit to and northbound entrance part of Exit 20; also a ramp from I-90 west to I-93 north
			20A	South Station, Chinatown	Northbound exit is part of exit 20
		17.36	23	Purchase Street	No northbound exit
		17.69	24A	Government Center	Signed as exit 23 northbound
		17.90	24B	Route 1A north – Logan Airport	Southbound exit and northbound entrance
		18.10	26	Route 3 north (Storrow Drive) / Route 28 – Cambridge, North Station	North end of Route 3 overlap; Leverett Connector
		18.36	27	US 1 north (Tobin Bridge) – Revere	North end of US 1 overlap. Northbound exit/southbound entrance only. Access to US 1 North via Exit 26 southbound.
		End of Upper Deck northbound, beginning of Lower Deck southbound
Middlesex	Somerville	19.52	28	To Route 99 – Sullivan Square, Somerville, Charlestown	traffic landmark: Schrafft's building
		20.41	29	Route 28 / Route 38 (Mystic Avenue) – Somerville, Everett	Signed as exit 30, at Mile 21.2 southbound
	Medford
		22.09	31	Route 16 (northbound: Mystic Valley Parkway toward Arlington southbound: Mystic Valley Parkway (at Harvard St) toward Revere via Revere Beach Parkway)
		22.49	32	Route 60 – Medford Square, Malden	Tufts University (Medford/Somerville Campus)
		23.16	33	Route 28 (Fellsway West) – Winchester	Roosevelt Circle
	Stoneham	25.28	34	Route 28 north – Stoneham, Melrose	Northbound exit and southbound entrance
		26.03	35	Winchester Highlands, Melrose	Southbound exit and northbound entrance
	Woburn	26.87	36	Montvale Avenue - Stoneham, Woburn
	Reading	28.42	37	I-95 / Route 128 – Peabody, Waltham	Signed as exits 37A (north) and 37B (south)
	Woburn	29.88	37C	Commerce Way, Atlantic Avenue
	Wilmington	31.07	38	Route 129 – Reading, Wilmington
		32.57	39	Concord Street
		34.00	40	Route 62 – North Reading, Wilmington
		34.57	41	Route 125 – Andover, North Andover
Essex	Andover	37.62	42	Dascomb Road - Tewksbury
		39.13	43	Route 133 – Andover, North Tewksbury	Signed as exits 43A (east) and 43B (west) southbound
		40.44	44	I-495 – Lawrence, Lowell	Signed as exits 44A (north) and 44B (south)
		42.36	45	River Road - South Lawrence
	Methuen	43.40	46	Route 110 / Route 113 – Lawrence, Dracut
		45.04	47	Pelham Street
		45.42	48	Route 213 east – Methuen, Haverhill
Massachusetts – New Hampshire state line
Rockingham	Salem	1.76	1	NH 28 (Rockingham Park Boulevard) to NH 38 – Salem
		3.00	2	To NH 38 / NH 97 (Pelham Road) – Salem, Pelham
	Windham	5.78	3	NH 111 – Windham, North Salem
	Londonderry	11.66	4	NH 102 – Derry, Londonderry
		15.24	5	NH 28 – North Londonderry
Hillsborough	Manchester	19.43		NH 101 west / I-293 north – Bedford, Manchester, Manchester Airport	Southern terminus of I-293; NH 101 joins northbound and leaves southbound
		20.60	6	Candia Road, Hanover Street
		21.31	7	NH 101 east – Portsmouth, Seacoast	NH 101 leaves northbound and joins southbound
		22.01	8	To NH 28A (Wellington Road / Bridge Street)
Merrimack	Hooksett	23.86	9S-N	US 3 / NH 28 – Hooksett, Manchester
		25.65	10	NH 3A – Hooksett
		26.31		I-293 / Everett Tpke. south – Manchester, Nashua	Everett Turnpike continues south on I-293, joins northbound (unsigned)
		28.66	11	To NH 3A (Hooksett) / Hackett Hill Road
	Bow	35.37		I-89 north – Lebanon, White River Junction VT	Southern terminus of I-89.
	Concord	36.04	12	NH 3A (South Main Street) to I-89 – Bow Junction
		37.21	13	US 3 (Manchester Street) – Downtown Concord
		38.34	14	NH 9 (Loudon Road) – State Offices
		38.87	15E	I-393 / US 4 / US 202 east – Loudon, Portsmouth	Western terminus of I-393; US 4 joins northbound and leaves southbound; Everett Turnpike designation ends
		38.87	15W	US 202 west to US 3 (North Main Street)
		40.29	16	NH 132 – East Concord
		44.45	17	US 4 to US 3 / NH 132 – Boscawen, Penacook	US 4 joins southbound and leaves northbound
	Canterbury	47.72	18	NH 132 / West Road – Canterbury
	Northfield	54.80	19	NH 132 – Northfield, Franklin	Northbound exit and southbound entrance
Belknap	Tilton	56.72	20	US 3 / NH 11 / NH 132 / NH 140 – Laconia, Tilton
	Sanbornton	60.97	22	NH 127 – Sanbornton, West Franklin
	New Hampton	69.01	23	NH 104 / NH 132 – Meredith, New Hampton
Grafton	Ashland	75.06	24	US 3 / NH 25 – Ashland, Holderness
	Holderness	79.75	25	NH 175A / Holderness Road – Plymouth
	Plymouth	80.64	26	US 3 / NH 25 / NH 3A – Plymouth, Rumney	Northern terminus of Route 3A
	Campton	83.50	27	US 3 – West Campton
			28	NH 49 to NH 175 – Campton, Waterville Valley
	Thornton	88.29	29	US 3 – Thornton
	Woodstock	94.78	30	US 3 – Woodstock, Thornton
		97.05	31	To NH 175 (Tripoli Road)
		100.20	32	NH 112 – Lincoln, North Woodstock
	Lincoln	102.23	33	US 3 – North Woodstock, North Lincoln
		Begin Franconia Notch Parkway
		104.16 105.23	34A	US 3 south – Flume Gorge Park Information Center	No southbound entrance, begin US 3 concurrency
	Franconia	110.02	34B	Cannon Mountain Tramway – Old Man Historic Site
		110.82	34C	NH 18 – Echo Lake Beach, Peabody Slopes, Cannon Mountain	Southern terminus of Route 18.
		End Franconia Notch Parkway
		112.36	35	US 3 north – Twin Mountain, Lancaster	Northbound exit and southbound entrance, end US 3 concurrency
		112.91	36	NH 141 to US 3 – Twin Mountain, South Franconia
		115.61	37	NH 18 / NH 142 – Franconia, Bethlehem	Northbound exit and southbound entrance
		116.39	38	NH 18 / NH 116 / NH 117 – Franconia, Sugar Hill	Also signed southbound as to NH 142
	Bethlehem	118.95	39	NH 118 / NH 116 – North Franconia, Sugar Hill	Southbound exit and northbound entrance
		120.72	40	US 302 / NH 18 – Bethlehem, Twin Mountain
	Littleton	122.28	41	US 302 (Cottage Street) to NH 18 / NH 116 – Littleton, Whitefield
		124.26	42	US 302 to NH 10 – Littleton, Woodsville
		125.88	43	NH 135 to NH 18 – Littleton, Dalton
		130.07	44	NH 18 / NH 135 – Monroe, Waterford VT
New Hampshire – Vermont state line
Caledonia	Waterford	7.51	1	VT 18 to US 2 – St. Johnsbury
		11.10		I-91 – St. Johnsbury, White River Junction	Northbound junction only Northern terminus
1.000 mi = 1.609 km; 1.000 km = 0.621 mi      Concurrency terminus •      Closed/Former •      Incomplete access •      Unopened

Auxiliary routes

• Manchester, New Hampshire—I-293: The southernmost portion of this highway, between I-93 and the Everett Turnpike, was once known as Interstate 193.
• Concord, New Hampshire—I-393

References

1. ^ Federal Highway Administration (2002-10-31). "FHWA Route Log and Finder List: Table 1". http://www.fhwa.dot.gov/reports/routefinder/table1.htm. Retrieved 2007-03-28. 
2. ^ Google, Inc. Google Maps – Interstate 93 (Map). Cartography by Google, Inc. http://maps.google.com/maps?hl=en&ie=UTF8&ll=42.208621,-71.13759&spn=0.019454,0.053215&t=h&z=14. Retrieved June 8, 2009. 
3. ^ Google, Inc. Google Maps – Interstate 93 (Map). Cartography by Google, Inc. http://maps.google.com/maps?f=q&hl=en&geocode=&q=I-93&sll=42.009555,-71.71815&sspn=1.910206,3.405762&ie=UTF8&ll=44.398498,-72.012548&spn=0.01435,0.026608&t=h&z=15. Retrieved June 8, 2009. 
4. ^ "Office of Transportation Planning - 2005 Road Inventory". Executive Office of Transportation. http://www.eot.state.ma.us/default.asp?pgid=content/plan02&sid=about. Retrieved 2007-08-29. 
5. ^ "New Hampshire DOT Route Logs". New Hampshire Department of Transportation. http://199.192.2.93/NHRouteLog/. Retrieved 2007-08-29. 
6. ^ "VTrans Traffic Log". Vermont Agency of Transportation. Archived from the original on August 11, 2007. http://web.archive.org/web/20070811155555/http://www.aot.state.vt.us/Planning/Documents/TrafResearch/Publications/2004RouteLogAADTs.pdf. Retrieved 2007-08-29. 
7. ^ http://www.massdot.state.ma.us/Highway/bigdig/facts_figures.aspx#traffic
8. ^ ^{a b} "Traffic Counts for Rte. I-93". Massachusetts Highway Department. http://www.mhd.state.ma.us/traffic.asp?f=&C=RTE.I-%2093. Retrieved 2008-09-14. 
9. ^ "Traffic Counts for Rte. 1 & I-93". Massachusetts Highway Department. http://www.mhd.state.ma.us/traffic.asp?f=&C=RTE.%20%201%20%26%20I-%2093. Retrieved 2008-09-14. 
10. ^ "Review Begins After Big Dig Tunnel Collapse". CNN.com. 2006-07-12. Archived from the original on July 15, 2006. http://web.archive.org/web/20060715075257/http://edition.cnn.com/2006/US/07/12/bigdigdeath.ap/index.html. Retrieved 2006-07-25. 
11. ^ http://www.bostonroads.com/roads/northern/
12. ^ Associated Press (January 12, 2009). 59-vehicle pileup closes I-93. Burlington Free Press. 
13. ^ Sherm Packard, NH State Representative (January 30, 2009). "Widening I-93 is now an urgent priority". The Concord Monitor. http://www.concordmonitor.com/apps/pbcs.dll/article?AID=/20090130/OPINION/901300333/1017. Retrieved 2009-02-06. 
14. ^ I-93\I-95 Interchange Transportation Study
15. ^ John Carr (2009) (PDF), I-93 / Route 110 / Route 113 Interchange Reconfiguration and Reconstruction Project: Draft Environmental Impact Report, Adriel Edwards; Douglas Kerr; Dan Moraseski; George Sanborn; Paul Schlichtman; Alexander Svirsky; Yanni Tsipis., Massachusetts Department of Transportation, http://www.env.state.ma.us/mepa/pdffiles/certificates/052909/14279npc.pdf 
16. ^ I-93/Lowell Junction Development Area Background
17. ^ Anderson, Steve. "Northern Expressway". BostonRoads.com. http://www.bostonroads.com/roads/northern/. Retrieved 22 May 2010. 
18. ^ Moskowitz, Eric (4 August 2010). "Officials expect I-93 north lanes in Medford to be open for a.m. commute". Boston Globe. http://www.boston.com/news/local/breaking_news/2010/08/pothole_forces.html. Retrieved 5 August 2010. 
19. ^ "I-93 Medford Bridges: 93Fast14 Video". Massachusetts Department of Transportation. 5 May 2011. http://transportation.blog.state.ma.us/blog/2011/05/i-93-medford-bridges-93fast14-video.html. Retrieved 20 June 2011. 
20. ^ "MassDot Accelerated Bridge Program: About the program". Massachusetts Department of Transportation. http://93fast14.dot.state.ma.us/about.html. Retrieved 20 June 2011. 
21. ^ James Vaznis (2007-08-31). "I-93 widening in N.H. set back". The Boston Globe. http://www.boston.com/news/local/articles/2007/08/31/i_93_widening_in_nh_set_back/. Retrieved 2007-10-14. 
22. ^ ^{a b} Davidson, Kate (2008-08-24). "I-93 projects move forward, not sideways". Concord Monitor. http://www.theconcordinsider.com/apps/pbcs.dll/article?AID=/20080824/FRONTPAGE/808240337&template=single. Retrieved 2008-09-13. ^{[dead link]}
23. ^ John Distaso (2009-02-18). "NH hustles for its slice of stimulus pie". New Hampshire Union Leader. MSNBC. http://www.msnbc.msn.com/id/29249554/. Retrieved 2009-02-20. "The biggest project on its list, the $31 million widening of Interstate 93 from Salem to Manchester, will be advertised on Feb. 24, Jannelle said." ^{[dead link]}
24. ^ NH Department of Transportation. "Rebuilding 93:Salem to Manchester - Project background". NH DOT. http://www.rebuildingi93.com/content/background/. Retrieved 2009-08-23. 
25. ^ Date, Terry (23 February 2010). "NH, Massachusetts lawmakers speak against I-93 toll". Eagle-Tribune. http://www.eagletribune.com/newhampshire/x1720285446/NH-Massachusetts-lawmakers-speak-against-I-93-toll?keyword=secondarystory. Retrieved 22 May 2010. 
26. ^ Landrigan, Kevin (20 March 2010). "Tolls nixed to pay for I-93 widening". Nashua Telegraph. http://www.nashuatelegraph.com/news/statenewengland/679077-227/tolls-nixed-to-pay-for-i-93-widening.html. Retrieved 22 May 2010. 
27. ^ "New Hampshire Mile Marker Locations". nhtrafficcams.com. http://www.nhtrafficcams.com/new_hampshire_mile_marker_locations.htm. Retrieved 23 May 2010. 
28. ^ Massachusetts Executive Office of Transportation. 2007. "Interchange Exit Lists (I-93)" Downloaded from http://www.eot.state.ma.us/default.asp?pgid=planning/disc/interchanges&sid=dtable, 8/7/2011.

External links

• John F. Fitzgerald Expressway/Central Artery (I-93)
• Alan B. Shepard Highway (I-93)
• Everett Turnpike (US 3, I-293, and I-93)
• New Hampshire's official site on the rebuilding and expansion of I-93 south of Manchester

Browse numbered routes
← I-91	MA	I-95 →
← I-89	NH	I-95 →
← I-91	VT	VT 100 →

edit Main Interstate Highways (major interstates highlighted)
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35	37	39	40	43	44	45	49	55	57	59	64	65	66	68	69
70	71	72	73	74	75	76 (W)		76 (E)		77	78	79	80	81	82
83	84 (W)		84 (E)		85	86 (W)		86 (E)		87	88 (W)		88 (E)		89	90
91	93	94	95	96	97	99	H-1		H-2		H-3
Unsigned			A-1		A-2		A-3		A-4		PRI-1		PRI-2		PRI-3
Lists		Primary			Main - Intrastate - Suffixed - Temporary - Future - Gaps
		Auxiliary			Main - Future - Unsigned
		Other			Standards - Business - Bypassed - Tolled