Editing Interstate 93 (section)

==Route description==
{{lengths_table|length_ref=<ref name="fhwa" />}}
|-
|{{abbr|MA|Massachusetts}}
|{{convert|47.07|mi|km|disp=table}}
|-
|{{abbr|NH|New Hampshire}}
|{{convert|131.78|mi|km|disp=table}}
|-
|{{abbr|VT|Vermont}}
|{{convert|11.10|mi|km|disp=table}}
|-
|Total
|{{convert|189.95|mi|km|disp=table}}
|}

===Massachusetts===
{{see also|Central Artery}}
[[File:End Interstate 93 in Canton, MA.JPG|thumb|left|Southern terminus of I-93 at I-95 in [[Canton, Massachusetts]]]]
I-93's southern terminus is at exit&nbsp;26 (formerly exit&nbsp;12) of [[I-95]] in [[Canton, Massachusetts|Canton]], cosigned with [[U.S. Route 1|US&nbsp;1]] north. At this junction, I-95 north heads to the northwest (cosigned with US&nbsp;1 south, as well as [[Massachusetts Route 128|Route&nbsp;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 southernmost {{convert|3|mi|km|spell=in}} of I-93 run east through Boston's southern suburbs, passing through Canton and [[Randolph, Massachusetts|Randolph]]. In Randolph, I-93 meets the northern end of [[Massachusetts Route 24|Route&nbsp;24]] (Fall River Expressway/AMVETS Memorial Highway) at exit&nbsp;4. I-93 continues east into [[Braintree, Massachusetts|Braintree]], interchanging with [[Massachusetts Route 3|Route&nbsp;3]], the major freeway linking Boston to [[Cape Cod]], at exit&nbsp;7 (known locally as the "[[Braintree Split]]"). Route&nbsp;3 north joins I-93 and US&nbsp;1, and the highway turns north toward Boston. These first {{convert|7|mi|km|spell=in}} of I-93 follow what was formerly part of Route&nbsp;128 before it was truncated at the I-95/I-93 junction.

[[File:Boston Signs.jpg|thumb|Signs in the [[Financial District, Boston|Financial District]] of [[Boston]] pointing toward [[Downtown Crossing]], [[Chinatown, Boston|Chinatown]], I-93, and I-90]]
Upon turning northward, the highway is known as the Southeast Expressway, passing through [[Quincy, Massachusetts|Quincy]] and [[Milton, Massachusetts|Milton]] before crossing into the city of [[Boston]] over the [[Neponset River]]. After the [[Massachusetts Avenue (metropolitan Boston)|Massachusetts Avenue]] connector exit, the highway officially becomes the [[John F. Fitzgerald Expressway]], also known as the [[Central Artery]], and passes beneath Downtown Boston. A major intersection with the [[Massachusetts Turnpike]]/I-90 (exit&nbsp;16, formerly 20) takes place just south of Downtown Boston. After the massive interchange, motorists use the [[O'Neill Tunnel]] to travel underneath the city and then use the [[Leonard P. Zakim Bunker Hill Memorial Bridge]] to cross the [[Charles River]]. Two exits are located in the tunnel, where the speed limit is {{convert|45|mph|km/h|abbr=on}}. [[Massachusetts Route 3|Route&nbsp;3]] leaves the Artery just before the Zakim bridge via exit&nbsp;18 (formerly 26), and US&nbsp;1 leaves the Artery just after the bridge, via exit&nbsp;19 (formerly 27) (no southbound access). From Boston through the rest of Massachusetts, [[Concord, New Hampshire]], 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 I-95 and Route&nbsp;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, Massachusetts|Andover]], I-93 meets [[Interstate 495 (Massachusetts)|I-495]], providing access to [[Worcester, Massachusetts|Worcester]] to the southwest and New Hampshire's [[Seacoast Region (New Hampshire)|Seacoast Region]] to the northeast. Just south of the state line, I-93 crosses the [[Merrimack River]] into [[Methuen, Massachusetts|Methuen]], where it intersects [[Massachusetts Route 110|Route&nbsp;110]] and [[Massachusetts Route 113|Route&nbsp;113]] at exit&nbsp;43 (formerly 46) just north of the river crossing. Between 2014 and 2018, the Route&nbsp;110/Route&nbsp;113 junction beneath I-93 was converted from a [[Roundabout|rotary]] to a [[partial cloverleaf]], with the new traffic patterns opening in various stages during 2016 and 2017.<ref name="Methuen Rotary Completion">{{cite web |title = Methuen Rotary Project: Major Milestone Reached |url = https://blog.mass.gov/transportation/massdot-highway/methuen-rotary-project-major-milestone-reached/ |website = MassDOT Blog |publisher = Massachusetts Department of Transportation |access-date = October 22, 2020 |archive-date = October 21, 2020 |archive-url = https://web.archive.org/web/20201021201240/http://blog.mass.gov/transportation/massdot-highway/methuen-rotary-project-major-milestone-reached/ |url-status = dead }}</ref> On I-93 northbound, the exit was split into 43A (formerly 46A) for Route&nbsp;110 and Route&nbsp;113 eastbound, and 43B (formerly 46B) for Route&nbsp;110 and Route&nbsp;113 westbound. I-93 then interchanges with the western end of [[Massachusetts Route 213|Route&nbsp;213]], a connector between I-93 and I-495. I-93 then crosses into [[New Hampshire]] after about {{convert|1|mi|km|spell=in}}.

In all, I-93 has 46 (formerly 48) numbered exits in Massachusetts, although, before the [[Mileage-based exit numbering|mileage-based exit numbering system]] was implemented in 2021, several numbers were skipped in and near Boston. Several exits were removed from I-93 to address traffic problems in addition to converting the Central Artery from 6 to 8 to 10&nbsp;lanes, by reducing the combined number of on- and offramps from 27 to 14.<ref>{{cite web |url = http://www.massdot.state.ma.us/Highway/bigdig/facts_figures.aspx#traffic |publisher = [[Massachusetts Department of Transportation]] |access-date = September 25, 2014 |url-status = dead |title = The Central Artery/Tunnel Project - The Big Dig - Facts & Figures |archive-date = June 13, 2011 |archive-url = https://web.archive.org/web/20110613134450/http://www.massdot.state.ma.us/highway/bigdig/facts_figures.aspx#traffic }}</ref> Exit&nbsp;46 (formerly 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&nbsp;exits prior to the rerouting of I-95 onto [[Massachusetts Route 128|Route&nbsp;128]].<ref name="I-93 photos">{{cite web |title = Alps' Roads I-93 Photos |url = http://www.alpsroads.net/roads/ma/i-93/6.html |publisher = Alps' Roads |access-date = November 18, 2012 }}{{self-published inline|certain=yes|date=May 2022}}</ref> Nearly the entire length of I-93 in Massachusetts carries four lanes in each direction. Average daily traffic volumes on I-93 in the state range from 100,000&nbsp;vehicles at the New Hampshire border<ref name="I93">{{cite web |url = http://www.mhd.state.ma.us/traffic.asp?f=&C=RTE.I-%2093 |publisher = Massachusetts Highway Department |title = Traffic Counts for Rte. I-93 |access-date = September 14, 2008 |url-status = dead |archive-url = https://web.archive.org/web/20090721002141/http://www.mhd.state.ma.us/traffic.asp?f=&C=RTE.I-%2093 |archive-date = July 21, 2009 }}</ref> and 150,000&nbsp;vehicles at the southern end at I-95<ref>{{cite web |url = http://www.mhd.state.ma.us/traffic.asp?f=&C=RTE.%20%201%20%26%20I-%2093 |publisher = Massachusetts Highway Department |title = Traffic Counts for Rte. 1 & I-93 |access-date = September 14, 2008 |url-status = dead |archive-url = https://web.archive.org/web/20120210024829/http://www.mhd.state.ma.us/traffic.asp?f=&C=RTE.%20%201%20&%20I-%2093 |archive-date = February 10, 2012 }}</ref> to over 200,000&nbsp;vehicles through Braintree and Quincy.<ref name="I93" />

===New Hampshire===
I-93 travels just over {{convert|131|mi|km}} in the Granite State, about two-thirds of the highway's total distance. Serving as the main Interstate route in New Hampshire, it connects the state capital, [[Concord, New Hampshire|Concord]], and its largest city, [[Manchester, New Hampshire|Manchester]]. Beyond Concord are the towns of [[Tilton, New Hampshire|Tilton]], [[Plymouth, New Hampshire|Plymouth]], and [[Littleton, New Hampshire|Littleton]]. I-93 is designated as the Alan B. Shepard Highway,<ref>{{cite web |url = http://www.bostonroads.com/roads/I-93S_NH/ |title = Alan B Shepard Highway (I-93) |access-date = September 25, 2014 }}</ref> from the Massachusetts line to [[Hooksett]] (just north of Manchester at the northern terminus of I-293), as the [[Everett Turnpike]] from Hooksett to Concord, and as the Styles Bridges Highway, after the [[Styles Bridges|US politician]], 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, New Hampshire|Bow]], I-93 also carries the northern end of the Everett Turnpike. There is one toll booth along this section, at exit&nbsp;11 in Hooksett; the toll for passenger cars is $1.00 ($0.50 at the ramp toll booth). This is the only toll collected along the entire length of the highway. 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, New Hampshire|Salem]]. A rest area and welcome center is available on the northbound side of the freeway, directly before exit&nbsp;1. I-93 is four lanes wide in each direction for its first {{convert|18.5|mi|km}}, until the split with I-293 and [[New Hampshire Route 101]] (NH&nbsp;101), where I-93 drops to three lanes before adding a fourth and fifth lane back to the freeway after the interchange. The construction to widen I-93 to four lanes each way between the Massachusetts–New Hampshire border and its junction with I-293 and NH&nbsp;101 was fully complete as of April 2021.<ref>{{Cite web|title=Salem-Manchester 10418-C {{!}} Project Specific Information {{!}} Project Center |publisher = New Hampshire Department of Transportation|url=https://www.nh.gov/dot/projects/salem10418c/index.htm|access-date=April 29, 2021}}</ref>

[[File:I-93 North approaching I-293 North in Manchester.jpg|thumb|I-93 north approaching its southern interchange with I-293 and NH&nbsp;101 in Manchester]]
I-93 and NH&nbsp;101 run concurrently for about {{convert|1|mi|km|spell=in}} before NH&nbsp;101 exits to the east as its own freeway, serving [[Portsmouth, New Hampshire|Portsmouth]] and the Seacoast Region. I-93 maintains three lanes of traffic in each direction until the junction with I-89, then is a four-lane freeway through most of its journey northward, with the only exception being the [[Franconia Notch]] section.

[[File:I-93 Franconia Notch.jpg|thumb|right|Northbound lane of I-93/US&nbsp;3 in Franconia Notch]]
In the state capital of Concord, [[I-393]] heads directly east (cosigned with eastbound [[U.S. Route 4|US&nbsp;4]] and [[U.S. Route 202|US&nbsp;202]]), providing another route to the Seacoast Region. Westbound US&nbsp;4 joins I-93 and runs concurrently with it, crossing the [[Merrimack River]] again, until exit&nbsp;17 for [[Penacook]], about {{convert|5|mi|km|spell=in}} farther north, before exiting westward. Continuing north, I-93 traverses the [[Lakes Region (New Hampshire)|Lakes Region]] of New Hampshire and then makes its way north through the heart of the [[White Mountains Region]]. I-93 passes through [[Franconia Notch State Park]] as a [[two-lane freeway]] (one lane in each direction) with a {{convert|45|mph|km/h|adj=on}} speed limit, designed to reduce I-93's impact on Franconia Notch. For the trip through Franconia Notch, I-93 and US&nbsp;3 run concurrently.

Beyond Franconia Notch State Park, US&nbsp;3 heads northeastward through the [[Great North Woods Region (New Hampshire)|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&nbsp;42. After passing through town, it crosses the [[Connecticut River]] into [[Vermont]]. The last exit along I-93 is exit&nbsp;44 for [[Monroe, New Hampshire|Monroe]], through which a rest area and 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 I-93 to {{convert|70|mph|km/h|abbr=on}} from milemarker&nbsp;45 to the Vermont border, with the exception of the Franconia Notch Parkway. The new limit took effect on January 1, 2014.

===Vermont===
I-93 runs for {{convert|11|mi|km}} in [[Vermont]], with one numbered exit in the state before ending at the interchange with [[I-91]] in [[St. Johnsbury]] in the [[Northeast Kingdom]] of Vermont. A rest area and welcome center is located along the northbound side of the highway for travelers entering from New Hampshire. The final {{convert|3|mi|km|spell=in}} of the Interstate actually veer to the southwest while traveling northbound. Vehicles bound for Canada can use northbound I-91 to reach the [[Derby Line–Stanstead Border Crossing]] at that Interstate's end, and [[Quebec Autoroute 55|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|US&nbsp;2]] and [[Vermont Route 18]] (VT&nbsp;18).