Interstate 93

Interstate 93 (I-93) is an Interstate Highway in the New England region of the United States. It begins in Canton, Massachusetts, in the Boston metropolitan area, at I-95;[3] and ends near St. Johnsbury, Vermont, at I-91.[4] It is one of three mainline Interstate highways located wholly within New England, the other two being I-89 and I-91. The largest cities along its route are Manchester, New Hampshire, and Boston, Massachusetts. It also passes through the New Hampshire state capital of Concord.

Interstate 93
I-93 highlighted in red
Route information
Length	189.95 mi[1] (305.69 km)
Existed	1957–present
Restrictions	No hazardous goods and cargo tankers between exits 18 and 26 in Massachusetts[2]
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 US 3 / NH 28 in Hooksett, NH I-89 in Bow, NH US 4 in Canterbury, NH US 2 in Waterford, VT
North end	I-91 in Waterford, VT
Location
States	Massachusetts, New Hampshire, Vermont
Counties	MA: Norfolk, Suffolk, Middlesex, Essex NH: Rockingham, Hillsborough, Merrimack, Belknap, Grafton VT: Caledonia
Highway system
Interstate Highway System Main Auxiliary Suffixed Business Future Massachusetts State Highway System Interstate US State New Hampshire Highway System Interstate U.S. State Turnpikes State highways in Vermont ← I‑91 MA I‑95 → ← I-89 NH I-95 → ← I-91 VT VT 100 →

For most of its length, I-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. I-93 follows the Southeast Expressway south of downtown Boston, the Central Artery through Boston, and the Northern Expressway from Boston to the New Hampshire state line.

Route description

Lengths

	mi[5][6][7]	km
MA	46.25	74.43
NH	131.764	212.054
VT	11.104	17.870
Total	189.118	304.356

Massachusetts

See also: Central Artery

Southern terminus of I-93 in Canton, MA

Interstate 93's southern terminus is at exit 12 of I-95 in Canton, 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. This violates the numbering plan for the highway system of the United States, which dictates that the signed number for odd-numbered interstates increase from west to east, and therefore I-95 should be farther east than I-93.

The southernmost 3 miles (4.8 km) 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. These first 7 miles (11 km) of I-93 follows what was formerly part of Massachusetts Route 128 before it was truncated at the I-95/I-93 junction and many locals still refer to this section of roadway as part of Route 128.

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 passing through Quincy and Milton before crossing into the city of Boston over the Neponset River. 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 interchange with Interstate 95 and Route 128, which run concurrently. 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 Routes 110 and 113 at exit 46 just north of the river crossing. Prior to August 2016, the Route 110 and 113 junction beneath I-93 was a rotary, but current construction routes the highways straight under I-93. While two new ramps are being built at the interchange to complete the new partial cloverleaf format, there are temporary signals and inlets at the end of two existing ramps to serve traffic that will soon be using the new loop ramps. Work began in July 2014, on the project, and with the rotary closed, demolition of the rotary will be underway in late 2016. The full project is scheduled for completion in June 2018.[8] I-93 then interchanges with the western end of Route 213, a connector between I-93 and I-495. I-93 then crosses into New Hampshire after about 1 mile (1.6 km).

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.[9] Exit 48 in Methuen, just before the New Hampshire state line, is the highest-numbered exit along the entire route. I-93 once had only 22 exits prior to the re-routing of I-95 onto MA 128.[10] 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[11] and 150,000 vehicles at the southern end at I-95[12] to over 200,000 vehicles through Braintree and Quincy.[11]

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 designated as the Alan B. Shepard Highway,[13] from the Massachusetts line to Hooksett (just north of Manchester at the northern terminus of I-293), as the F.E. Everett Turnpike from Hooksett to Concord, and as the Styles Bridges Highway from Concord to the Vermont line. This section of roadway was constructed between 1961 and 1977.

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; the toll for passenger cars is $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. A rest area/welcome center is available on the northbound side of the freeway, directly before Exit 1. I-93 remains three lanes wide in each direction for its first 7 miles (11 km), until after the exit 3 interchange in Windham. It then drops to two lanes until the split with Interstate 293 and the junction with New Hampshire Route 101 add a third and fourth lane back to the freeway. Construction is currently underway to widen I-93 between Exit 3 and its junction with I-293 and NH-101. As of July 2020, the project is almost complete (currently completed from exit 4 onwards). I-93 and New Hampshire Route 101 run concurrently for about 1 mile (1.6 km) 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 (one lane in each direction) with a 45 miles per hour (70 km/h) speed limit, designed to reduce I-93's impact on Franconia Notch. 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 four 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.

In 2013, a bill was signed by governor Maggie Hassan to raise the speed limit on Interstate 93 to 70 mph (115 km/h) from mile marker 45 to the Vermont border. The new limit took effect on January 1, 2014.

Vermont

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

Interstate 93 runs for 11 miles (18 km) in Vermont, with one numbered exit in the state before ending at the interchange with Interstate 91 in St. Johnsbury in the Northeast Kingdom of Vermont. A rest area/welcome center is located along the northbound side of the highway for travelers entering from New Hampshire. The final 3 miles (4.8 km) of the Interstate, just before its terminus, actually veer to the southwest. Vehicles bound for Canada can use northbound I-91 to reach the Derby Line/Stanstead border crossing at that Interstate's end, and northwards into Canada as an "autoroute" freeway into the Canadian province of Quebec. The portion of I-93 in Vermont parallels both U.S. Route 2 and Vermont Route 18.

History

Southeast Expressway

The Southeast Expressway was constructed between 1954 and 1959, at the same time the John F. Fitzgerald Expressway (Central Artery) was built. Its northern terminus is at Exit 18 (Massachusetts Avenue) in South Boston, a former Y-interchange where the cancelled Inner Belt (I-695) was to meet with the expressway and the Central Artery. The southern terminus is at the Y-interchange (the "Braintree Split") at Exit 7 in Braintree (the former southern terminus of Route 128). A section of the Expressway, beginning south of the Savin Hill overpass and ending just before the Braintree Split 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. Most of the right of way for the Granite Railway in Milton and Quincy was incorporated into the expressway.[14]

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.[15] Construction on the new I-93 segment was not without serious issues: a lengthy 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 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 open to general traffic.

Hazardous cargoes are prohibited from I-93 in Boston due to safety issues in the tunnels; these cargoes must exit at either the Leverett Circle connector 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

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.[16]

I-93's original southern terminus was in Cambridge (just north of Boston) where it was to meet the Inner Belt (I-695). However, when that route was canceled, and the I-95 section into Boston was canceled and rerouted along Route 128 in the mid-1970s, I-93's route was extended an additional 18 miles (29 km) down the Central Artery (which had been signed as a concurrency of I-95/MA-3 before I-95 was rerouted) and the Southeast Expressway (what was then just Route 3) from Boston to Braintree and then west along former Route 128 to its intersection with I-95 in Canton.

In an attempt to alleviate rush-hour traffic jams, travel in the breakdown lane of I-93 is permitted on a small stretch between Exit 41 and Exit 47/48. This extra travel is permitted on the southbound side on weekdays between 6AM and 10AM, and on the northbound side between 3PM and 7PM. However, on most busy days this fails to prevent traffic delays. The Massachusetts State Police is displeased with this arrangement, citing that traffic in the breakdown lanes interferes with the ability of emergency vehicles to respond to accidents.

Rapid bridge replacement project

In August 2010, in Medford, a 25-by-7-foot (7.6 m × 2.1 m) section of bridge deck on the northbound side partially collapsed due to age-related structural fatigue.[17] 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. The MassDOT set in motion a plan to replace the superstructure and concrete decks on 14 overpass bridges along that section of the interstate, using rapid bridge replacement methods. 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.[18][19]

Methuen Rotary

Off exit 46 in Methuen, Massachusetts, the surface level traffic circle was rebuilt as part of an overall infrastructure improvement that also included constructing a new bridge carrying the interstate over the local road, reconstructing on- and off-ramps to the highway, and realigning the interstate itself.[20]

New Hampshire

Exit 1 in Salem was originally designed and built with ramps allowing northbound traffic to exit to Rockingham Park 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, which was replaced in August 2012.

A 7.6-mile (12 km) section of I-93 through Franconia Notch State Park, called the Franconia Notch Parkway, 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", 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. This section of the highway is the only remaining section of two-lane freeway on an Interstate highway in the United States.

Vermont

Construction of Interstate 93 was completed in 1982, in Vermont. It was planned to be built longer if I-91 didn't change its designation eastward in northeastern part of the state.[21] It was the last interstate to be built in the state.[22]

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.[23] The project was expected to start in Spring 2017 and cost $267 million, however continued community opposition has postponed the project indefinitely.[24] A project to upgrade the I-93/I-95 interchange in Canton is proposed.

An additional proposal around 2010, to upgrade MA Route 24, running southwards from I-93's Exit 4, to Interstate 195 near Fall River, MA also has been put off due to studies showing the cost of the project being very high.[25]

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 lane drop near Exit 41 in Wilmington to the New Hampshire border since the beginning of the 2000s.[26] 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 in each direction 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.[27]

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 New Hampshire Department of Transportation (NHDOT) 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.[28] 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.[29]

As part of the 2009 stimulus package, New Hampshire was set to receive several million dollars in highway construction funds. One of the projects was the widening of a portion of the highway between the Massachusetts border and Manchester. Bidding was set to begin in February 2009 with construction slated to begin in late 2009 or early 2010.[30] 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 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.[29] 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.[31]

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).[32] 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.[33]

Plans were announced in 2012 that I-93 would have a new northbound and southbound bridge over Interstate 89 in Bow. To reduce traffic on the southbound bridge the NHDOT added a third lane to ease congestion. The bridges were completed in 2014.

More plans were announced in 2014 that the Hooksett rest areas would be rebuilt. The new rest areas would feature a 14-pump Irving gas station, a new New Hampshire liquor and wine outlet, and a few restaurants and shops. The project was completed in 2015.

In Londonderry, a new Exit 4A and connector road to the town of Derry were in final planning stages as of June 2020. Construction of Exit 4A, to be located approximately a mile north of Exit 4 in Londonderry, was slated to begin construction in late 2020.[34]

Exit list

Exits 17, 19, 21, and 25 in Massachusetts were eliminated as part of the Big Dig. Massachusetts exit numbers were to be changed to those based on I-93 mileposts with a project that was due to start in early 2016, but this project was postponed by the MassDOT for several years.[35][36][37] On November 18, 2019, the MassDOT confirmed that beginning in late summer 2020 the exit renumbering project would begin.[36][37]

State	County	Location [5][6][7][38]	mi [5][6][7][38]	km	Old exit [39][40]	New exit [37]	Destinations[39][40]	Notes
Massachusetts	Norfolk	Canton	0.000– 0.267	0.000– 0.430	1	1	I‑95 / Route 128 north / US 1 south – Dedham, Portsmouth, NH, Providence, RI	Signed as exits 1A (south) and 1B (north);[37] southern terminus of US 1 concurrency; exit 12 (scheduled to be exit 26[41]) on I-95; southern terminus of Route 128
			1.415	2.277	2	2	Route 138 – Stoughton, Milton	Signed as exits 2A (south) and 2B (north)[37]
		Milton	2.615	4.208	3	3	Ponkapoag Trail – Houghton's Pond
		Randolph	3.480	5.601	4	4	Route 24 south – Fall River	Left exit and entrance southbound; northern terminus of Route 24; exit 21 (scheduled to be exit 41[42]) on Route 24
			4.233	6.812	5	5	Route 28 – Randolph, Milton	Signed as exits 5A (south) and 5B (north)[37]
		Braintree	6.450	10.380	6	6	Route 37 – West Quincy, Braintree, Holbrook	Northern terminus of Route 37
			6.802	10.947	7	7	Route 3 south – Cape Cod	Braintree Split; left exit and entrance southbound; southern terminus of Route 3 concurrency; former southern terminus of Route 128
					South end of the Southeast Expressway
		Quincy	8.182	13.168	8	8	Furnace Brook Parkway – Quincy
		Milton	9.162	14.745	9	9	Adams Street – Milton, North Quincy	Northbound signage
			9.410	15.144			Bryant Avenue – West Quincy	Southbound signage
			10.134	16.309	10	10	Squantum Street – Milton	Southbound exit only[37]
			10.832	17.432	11A	11A	Granite Avenue east – East Milton	Southbound exit and northbound entrance
			10.842	17.449	11B	11B	Granite Avenue west to Route 203 – Ashmont	Signed as exit 11 northbound; no northbound entrance
	Suffolk	Boston	11.575	18.628	12	12	Route 3A south – Neponset, Quincy	No northbound exit[37]
			12.456	20.046	13	13A	Freeport Street – Dorchester	Northbound exit only[37]
			12.728	20.484	14	13B	Morrissey Boulevard – Savin Hill	Northbound exit and southbound entrance; commercial vehicles and buses prohibited
			14.343	23.083	15	14	Columbia Road – Dorchester, South Boston
			14.820	23.850	16	15A	Southampton Street – Andrew Square	Northbound exit and southbound entrance
					17		Frontage Road	Former northbound exit removed during Big Dig reconstruction
			15.100– 15.929	24.301– 25.635	18	15	Frontage Road / Massachusetts Avenue – Roxbury, Andrew Square	Signed as exit 15B northbound[37]
					19		East Berkeley Street / Broadway / Albany Street	Closed as part of Big Dig reconstruction
					North end of the Southeast Expressway, south end of the John F. Fitzgerald Expressway
			15.340	24.687	20	16	I‑90 / Mass Pike – Logan Airport, Worcester, South Station	Northbound exit and southbound entrance; exits 24/24C (scheduled to be exits 134/134C[43]) on I-90
						—	South Station / Airport	Northbound exit and southbound entrance to HOV lane
					South end of the Thomas P. O'Neill Jr. Tunnel
			17.253	27.766	20A 20B	16A	South Station	Southbound exit and northbound left entrance
							I‑90 / Mass Pike west	Southbound exit and northbound entrance; exits 24/24B (scheduled to be exits 134/134B[43]) on I-90
					21		Kneeland Street – Chinatown	Former southbound exit and northbound entrance; closed during Big Dig reconstruction
			16.694	26.866	22	—	Surface Road – Chinatown	Southbound entrance only
			17.340	27.906	23	17	Government Center	Northbound exit and southbound entrance via North Street
			17.487	28.143	23	16B	Purchase Street	Southbound exit and entrance only
			17.874	28.765	24A	17A	Government Center	Southbound exit only; northbound entrance closed; formerly served Clinton Street
					24B	17B	Route 1A north (Callahan Tunnel) – Airport	Southbound exit and northbound entrance
					North end of the Thomas P. O'Neill Jr. Tunnel
					25		Causeway Street – North Station / Haymarket Square / Government Center	Closed as part of Big Dig reconstruction
					Leonard P. Zakim Bunker Hill Memorial Bridge over the Charles River
			17.892– 19.585	28.794– 31.519	26	18	Route 3 north / Route 28 (Storrow Drive) – Leverett Circle, Cambridge, North Station[44]	Leverett Connector; signed as Storrow Drive northbound; northern terminus of concurrency with Route 3
					Charlestown High Bridge over the Charles River (demolished 2004 as part of Big Dig reconstruction; existed west of current alignment)
			18.603	29.939	27	19	US 1 north (Tobin Bridge) – Revere	Northbound left exit and southbound entrance; northern terminus of concurrency with US 1
					North end of the John F. Fitzgerald Expressway
	Middlesex	Somerville	19.230	30.948	28	20	To Route 99 – Sullivan Square, Somerville	Northbound exit only, partially in Boston
			20.415	32.855			Sullivan Square, Charlestown, Assembly Square	Southbound exit and northbound entrance
			20.259	32.604	29	21	Route 28 / Route 38 north – Somerville, Medford	Northbound exit and southbound entrance; southern terminus of Route 38
		Medford	21.323	34.316	30	21	Route 38 – Medford, Somerville	Southbound exit and northbound entrance
			21.743	34.992	31	22	Route 16 west (Mystic Valley Parkway) – Arlington	Northbound signage
			21.859	35.179			Route 16 east – Everett, Revere	Southbound signage
			22.554	36.297	32	23	Route 60 – Medford, Malden	Also to Route 16 southbound; to Tufts University's Medford/Somerville Campus
			23.229	37.383	33	24	Route 28 (Fellsway West) – Winchester	Roosevelt Circle
		Stoneham	25.276	40.678	34	25	Route 28 north – Stoneham, Melrose	Northbound exit and southbound entrance
			26.087	41.983	35	26	Park Street – Stoneham, Melrose	Southbound exit and northbound entrance
		Woburn	26.929	43.338	36	27	Montvale Avenue – Stoneham, Woburn
		Reading	28.476	45.828	37A-B	28	I‑95 / Route 128 – Peabody, Waltham	Split into exits 37A (north) and 37B (south);[37] exits 37A-B (scheduled to be exits 55A-B[41]) on I-95 / Route 128
		Woburn	29.965	48.224	37C	30	Commerce Way / Atlantic Avenue – Anderson RTC
		Wilmington	31.136	50.109	38	31	Route 129 – Reading, Wilmington
			32.635	52.521	39	33	Concord Street – Wilmington
			34.064	54.821	40	34	Route 62 – North Reading, Wilmington
			34.629	55.730	41	35	Route 125 – Andover, North Andover
	Essex	Andover	37.682	60.643	42	38	Dascomb Road – Tewksbury, Andover
			39.196	63.080	43	39	Route 133 – Andover, North Tewksbury	Signed as exits 43A (east) and 43B (west) southbound[37]
			40.521	65.212	44	40	I‑495 – Lawrence, Lowell	Split into exits 44A (north) and 44B (south);[37] exits 40A-B (scheduled to be exits 97A-B[45]) on I-495
			42.423	68.273	45	42	River Road – South Lawrence
		Merrimack River	43.139	69.425	General Edward D. Sirois Memorial Bridge
		Methuen	43.465	69.950	46	43	Route 110 / Route 113 – Lawrence, Dracut	Interchange rebuilt in 2017; signed as exits 46A (east) and 46B (west) northbound[37][8]
45.113			72.602	47	45	Pelham Street
45.483			73.198	48	46	Route 213 east (Loop Connector) – Methuen, Haverhill	Western terminus of Route 213; exits 1A/1B on Route 213
46.25 0.000			74.43 0.000	Massachusetts–New Hampshire line
	New Hampshire	Rockingham						Salem
1.368			2.202		1	Rockingham Park Boulevard to NH 28 / NH 38 – Salem	Originally northbound exit, southbound entrance only
3.001			4.830		2	Pelham Road to NH 38 / NH 97 – Salem, Pelham
Windham			5.821	9.368		3	NH 111 – Windham, North Salem
Londonderry			11.341	18.252		4	NH 102 – Derry, Londonderry
			15.291	24.608		5	NH 28 – North Londonderry
Hillsborough		Manchester	18.488	29.754		—	I-293 north / NH 101 west – Bedford, Manchester, Manchester Airport	Southern terminus of I-293; Southern terminus of concurrency with NH 101
			20.591	33.138		6	Candia Road / Hanover Street	Northbound entrance to NH 101 East only; Southbound exit from I-93 only
			20.967	33.743		7	NH 101 east – Portsmouth, Seacoast	Northern terminus of concurrency with NH 101
			22.093	35.555		8	Wellington Road / Bridge Street to NH 28A
Merrimack		Hooksett	23.922	38.499		9	US 3 / NH 28 – Hooksett, Manchester	Split into exits 9N (north) and 9S (south)
			25.727	41.404		10	NH 3A – Hooksett
			26.689	42.952		—	I-293 south / Everett Turnpike south – Manchester, Nashua, Manchester Airport	Northern terminus of I-293; Southern terminus of concurrency with the Everett Turnpike
			28.659	46.122	Hooksett Main Toll Plaza
			28.751	46.270		11	Hackett Hill Road to NH 3A – Hooksett	Hooksett Ramp Toll Plaza
		Bow	35.495	57.124		—	I-89 north – Lebanon, White River Junction VT	Southern terminus of I-89
		Concord	35.977	57.899		12	NH 3A (South Main Street) to I-89 – Bow Junction	Split into exits 12S (south) and 12N (north)
			37.331	60.078		13	US 3 (Manchester Street) – Downtown Concord
			38.454	61.886		14	NH 9 (Loudon Road) – State Offices Everett Turnpike	Northern terminus of the Everett Turnpike Southern terminus of Styles Bridges Highway
			38.977	62.727		15E	I-393 east / US 4 east / US 202 east – Loudon, Portsmouth	Western terminus of I-393; Southern terminus of concurrency with US 4
						15W	US 202 west to US 3 (North Main Street) – Downtown Concord
			40.188	64.676		16	NH 132 – East Concord
			44.582	71.748		17	US 4 west to US 3 / NH 132 (Hoit Road) – Penacook, Boscawen	Northern terminus of concurrency with US 4; signed as exits 17W and 17E going southbound
		Canterbury	47.869	77.038		18	To NH 132 (West Road) – Canterbury
		Northfield	54.976	88.475		19	NH 132 – Northfield, Franklin	Northbound exit and southbound entrance
Belknap		Tilton	56.907	91.583		20	US 3 / NH 11 / NH 132 / NH 140 – Laconia, Tilton
		Sanbornton	61.159	98.426		22	NH 127 – Sanbornton, West Franklin
		New Hampton	69.229	111.413		23	NH 104 / NH 132 – Meredith, New Hampton
Grafton		Ashland	75.308	121.196		24	US 3 / NH 25 – Ashland, Holderness
		Holderness	79.992	128.735		25	NH 175A (Holderness Road) – Plymouth
		Plymouth	80.877	130.159		26	US 3 / NH 25 / NH 3A south – Plymouth, Rumney	Northern terminus of Route 3A
		Campton	83.762	134.802		27	To US 3 – Blair Bridge, West Campton
			86.819	139.722		28	NH 49 to NH 175 – Campton, Waterville Valley
		Thornton	88.542	142.495		29	US 3 – Thornton
		Woodstock	94.400	151.922		30	US 3 – Woodstock, Thornton
			97.334	156.644		31	To NH 175 (Tripoli Road)
			100.499	161.737		32	NH 112 – Lincoln, North Woodstock
		Lincoln	102.538	165.019		33	US 3 – North Woodstock, North Lincoln
					South end of the Franconia Notch Parkway
			104.315– 106.006	167.879– 170.600	1	34A	US 3 south – Flume Gorge, Park Information Center	Southern terminus of concurrency with US 3; No southbound entrance
		Franconia	110.158	177.282	2	34B	Cannon Mountain Tramway – Old Man Historic Site
			110.858	178.409	3	34C	NH 18 north – Echo Lake Beach, Peabody Slopes, Cannon Mountain	Southern terminus of NH 18
			111.401	179.283	North end of the Franconia Notch Parkway
			112.315	180.753		35	US 3 north – Twin Mountain, Lancaster	Northern terminus of concurrency with US 3; northbound exit and southbound entrance
			112.947	181.771		36	NH 141 to US 3 – Twin Mountain, South Franconia
			115.946	186.597		37	NH 18 / NH 142 – Franconia, Bethlehem	Northbound exit and southbound entrance
			116.728	187.856		38	NH 18 / NH 116 / NH 117 / NH 142 – Franconia, Sugar Hill	NH 142 not signed northbound
		Bethlehem	119.295	191.987		39	NH 18 / NH 116 – North Franconia, Sugar Hill	Southbound exit and northbound entrance
			120.777	194.372		40	US 302 / NH 18 – Bethlehem, Twin Mountain
		Littleton	122.418	197.013		41	NH 116 – Littleton, Whitefield
			124.397	200.198		42	US 302 / NH 10 to NH 18 – Littleton, Woodsville
			126.129	202.985		43	NH 135 to NH 18 – Littleton, Dalton
			130.355	209.786		44	NH 18 / NH 135 – Monroe, Waterford, VT
Connecticut River			131.764 0.000	212.054 0.000	Senator Andrew Poulsen Bridge[6] New Hampshire–Vermont line
Vermont	Caledonia	Waterford	7.510	12.086		1	VT 18 to US 2 – St. Johnsbury, Lower Waterford
			11.104	17.870			I-91 – St. Johnsbury, White River Junction	Exit 19 on I-91
1.000 mi = 1.609 km; 1.000 km = 0.621 mi       Closed/former       Concurrency terminus       HOV only       Incomplete access       Tolled

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 (October 31, 2002). "FHWA Route Log and Finder List: Table 1". Retrieved March 28, 2007.
2. "Hazardous material route designation". Mass.gov. Retrieved January 15, 2018.
3. Google (June 8, 2009). "Interstate 93" (Map). Google Maps. Google. Retrieved June 8, 2009.
4. Google (June 8, 2009). "Interstate 93" (Map). Google Maps. Google. Retrieved June 8, 2009.
5. MassDOT Planning Division. "Massachusetts Route Log Application". Massachusetts Department of Transportation. Archived from the original on August 26, 2014. Retrieved August 23, 2014.
6. Bureau of Planning & Community Assistance (February 20, 2015). "NH Public Roads". Concord, New Hampshire: New Hampshire Department of Transportation. Retrieved April 7, 2015.
7. Traffic Research Unit (May 2013). "2012 (Route Log) AADTs for State Highways" (PDF). Policy, Planning and Intermodal Development Division, Vermont Agency of Transportation. Retrieved March 7, 2015.
8. "Methuen Rotary Project: Home". Massachusetts Department of Transportation (MassDOT). Retrieved December 8, 2012.
9. "404". Massachusetts Department of Transportation. Retrieved September 25, 2014.
10. "Alps' Roads I-93 Photos". Alps' Roads. Retrieved November 18, 2012.
11. "Traffic Counts for Rte. I-93". Massachusetts Highway Department. Archived from the original on July 21, 2009. Retrieved September 14, 2008.
12. "Traffic Counts for Rte. 1 & I-93". Massachusetts Highway Department. Archived from the original on February 10, 2012. Retrieved September 14, 2008.
13. "Alan B Shepard Highway (I-93)". Retrieved September 25, 2014.
14. "The Successor Railroads". Thomas Crane Library. Retrieved September 12, 2017.
15. "Review Begins After Big Dig Tunnel Collapse". CNN. July 12, 2006. Archived from the original on July 15, 2006. Retrieved July 25, 2006.
16. "Northern Expressway (I-93)". Retrieved October 4, 2014.
17. Moskowitz, Eric (August 4, 2010). "Officials expect I-93 north lanes in Medford to be open for a.m. commute". Boston Globe. Retrieved August 5, 2010.
18. "I-93 Medford Bridges: 93Fast14 Video". Massachusetts Department of Transportation. May 5, 2011. Retrieved June 20, 2011.
19. "MassDot Accelerated Bridge Program: About the program". Massachusetts Department of Transportation. Archived from the original on June 8, 2011. Retrieved June 20, 2011.
20. Kashinsky, Leah (December 21, 2017). "MassDOT: 'Majority of construction' complete at former Methuen rotary". The Eagle-Tribune. North Andover, Massachusetts.
21. "Vermont @ AARoads - Interstate 93". www.aaroads.com. Retrieved May 22, 2017.
22. "Everett Turnpike (US 3, I-293, and I-93)". www.bostonroads.com. Retrieved May 22, 2017.
23. "I-93\I-95 Interchange Transportation Study". Retrieved October 4, 2014.
24. https://web.archive.org/web/20130616015526/http://www.mhd.state.ma.us/ProjectInfo/Main.asp?ACTION=ViewProject&PROJECT_NO=605605, archived from the original on June 16, 2013 Missing or empty |title= (help)
25. Timmins, Steve. "personal correspondence" (Microsoft Word DOC). Mass Highway.
26. "I-93/Lowell Junction Development Area Background". Archived from the original on July 2, 2014. Retrieved October 4, 2014.
27. Anderson, Steve. "Northern Expressway". BostonRoads.com. Retrieved May 22, 2010.
28. James Vaznis (August 31, 2007). "I-93 widening in N.H. set back". The Boston Globe. Retrieved October 14, 2007.
29. Davidson, Kate (August 24, 2008). "I-93 projects move forward, not sideways". Concord Monitor. Retrieved September 13, 2008.
30. John Distaso (February 18, 2009). "NH hustles for its slice of stimulus pie". New Hampshire Union Leader. MSNBC. Archived from the original on February 20, 2009. Retrieved February 20, 2009. 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.
31. NH Department of Transportation. "Rebuilding 93:Salem to Manchester – Project background". NH DOT. Retrieved August 23, 2009.
32. Date, Terry (February 23, 2010). "NH, Massachusetts lawmakers speak against I-93 toll". Eagle-Tribune. Retrieved May 22, 2010.
33. Landrigan, Kevin (March 20, 2010). "Tolls nixed to pay for I-93 widening". Nashua Telegraph. Retrieved May 22, 2010.
34. NH Department of Transportation. "I93 Exit 4A Project". NH DOT. Retrieved June 24, 2020.
35. Commonwealth of Massachusetts (November 17, 2015). "608024 - STATEWIDE "Exit Signage Conversion to Milepost-Based Numbering System along Various Interstates, Routes and the Lowell Connector"". Retrieved August 9, 2016.
36. "Milepost-based Exit Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 5, 2019.
37. "I-93 Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 5, 2019.
38. Bureau of Planning & Community Assistance (April 3, 2015). "Nodal Reference 2015, State of New Hampshire". New Hampshire Department of Transportation. Retrieved April 7, 2015.
    • Town of Salem, Rockingham County
    • Town of Windham, Rockingham County
    • Town of Londonderry, Rockingham County
    • City of Manchester, Hillsborough County
    • Town of Hooksett, Merrimack County
    • Town of Bow, Merrimack County
    • Town of Canterbury, Merrimack County
    • Town of Northfield, Merrimack County
    • Town of Tilton, Belknap County
    • Town of Sanbornton, Belknap County
    • Town of New Hampton, Belknap County
    • Town of Ashland, Grafton County
    • Town of Holderness, Grafton County
    • Town of Plymouth, Grafton County
    • Town of Campton, Grafton County
    • Town of Thornton, Grafton County
    • Town of Woodstock, Grafton County
    • Town of Lincoln, Grafton County
    • Town of Franconia, Grafton County
    • Town of Bethlehem, Grafton County
    • Town of Littleton, Grafton County
39. Massachusetts Department of Transportation. "Exit Numbers and Names: Route I-93 (Canton to Route US 1)". Archived from the original on August 26, 2014. Retrieved August 23, 2014.
40. "Exit Numbers and Names: Route I-93 (Route US 1 to Methuen)". Massachusetts Department of Transportation. Archived from the original on August 26, 2014. Retrieved August 23, 2014.
41. "I-95 Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 5, 2019.
42. "Route 24 and Route 25 Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 5, 2019.
43. "I-90 Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 5, 2019.
44. Google Maps (September 2013). "Street View". Retrieved August 23, 2014.
45. "I-495 Renumbering" (PDF). Massachusetts Department of Transportation. December 5, 2019. Retrieved December 5, 2019.

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