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Interstate 91
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== Route description == {{lengths table|length_ref=<ref name="fhwa" />}} |- |{{abbr|CT|Connecticut}} |{{convert|58.00|mi|km|disp=table}} |- |{{abbr|MA|Massachusetts}} |{{convert|54.99|mi|km|disp=table}} |- |{{abbr|VT|Vermont}} |{{convert|177.38|mi|km|disp=table}} |- |Total |{{convert|290.33|mi|km|disp=table}} |} I-91 is {{convert|290|mi|km}} long and travels north and south: {{convert|58|mi|km}} in [[Connecticut]], {{convert|55|mi|km}} in [[Massachusetts]], and {{convert|177|mi|km}} in [[Vermont]]. I-91 parallels [[U.S. Route 5|US Route 5]] (US 5) for all of its length, and many of the exits along I-91 provide direct or indirect access to the older route. Much of the route of I-91 follows the [[Connecticut River]], traveling from [[Hartford, Connecticut]], northward to [[St. Johnsbury, Vermont]].<ref>{{cite web |url = http://www.town.berlin.ct.us/topic/subtopic.php?topicid=34&structureid=15 |title = Background Information on the Interstate |publisher = Town of Berlin, Connecticut |access-date = December 29, 2017 |archive-date = December 30, 2017 |archive-url = https://web.archive.org/web/20171230115108/http://www.town.berlin.ct.us/topic/subtopic.php?topicid=34&structureid=15 |url-status = live }}</ref><ref>{{cite book |last1 = Rogers |first1 = Barbara |title = Massachusetts Off the Beaten Path: A Guide to Unique Places |date = 2003 |publisher = Globe Pequot Press |isbn = 9780762726059 |url = https://books.google.com/books?id=tUy44WnW9h0C&q=I-91+parallel+route-5 |access-date = August 19, 2019 |via = [[Google Books]] |language = en |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200613/https://books.google.com/books?id=tUy44WnW9h0C&q=I-91+parallel+route-5 |url-status = live }}</ref><ref>{{cite book |first = Vernon |last = Nahrgang |title = Fodor's91 New England |date = 2003 |page = 359 |publisher = Fodor's Travel Publications |isbn = 9780679019367 |url = https://books.google.com/books?id=5X-SJb3FUf8C&q=I-91+parallel+route-5 |access-date = August 19, 2019 |via = [[Google Books]] |language = en |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200613/https://books.google.com/books?id=5X-SJb3FUf8C&q=I-91+parallel+route-5 |url-status = live }}</ref> [[File:2016-09-03 08 44 00 View north along Interstate 91 just north of Exit 32 (Trumball Street-Interstate 84) in Hartford, Hartford County, Connecticut.jpg|alt=I-91 in Hartford.|thumb|I-91 in [[Hartford, Connecticut]]]] === Connecticut === [[File:Interstate_91_North_in_Hartford,_Connecticut.jpg|thumb]] I-91 is the major north–south transportation corridor for the center of the state. It is the main route between the larger cities of New Haven, Hartford, and [[Springfield, Massachusetts]]. As such, it is almost always heavily trafficked (especially during rush hour) and maintains at least three lanes in each direction through Connecticut except for a short portion in Hartford at the interchange with [[Interstate 84 (Pennsylvania–Massachusetts)|I-84]], and another in [[Meriden, Connecticut|Meriden]] at the interchange with [[Connecticut Route 15|Route 15]]. The three cities also serve as Connecticut's control points along its length of the Interstate.<ref>{{cite book |last1 = Boyle |first1 = Doe |title = Fun with the Family Connecticut: Hundreds of Ideas for Day Trips with the Kids |date = 2011 |publisher = Rowman & Littlefield |isbn = 978-0-7627-6879-0 |url = https://books.google.com/books?id=xic1huFa1ZEC&pg=PA144 |access-date = August 10, 2018 |via = [[Google Books]] |language = en |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200616/https://books.google.com/books?id=xic1huFa1ZEC&pg=PA144 |url-status = live }}</ref><ref name="impact">{{cite book |author = Bureau of Planning and Research |title = I-91 Reconstruction from Hartford to Enfield; I-291 Construction from Windsor to Manchester: Environmental Impact Statement |date = August 1984 |url = https://books.google.com/books?id=Lbs1AQAAMAAJ&pg=PA49 |access-date = August 10, 2018 |via = Google Books |language = en |page = 49 |location = [Wethersfield, CT] |publisher = [Connecticut Department of Transportation] |oclc = 53099516 |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200613/https://books.google.com/books?id=Lbs1AQAAMAAJ&pg=PA49 |url-status = live }}</ref> I-91 begins just east of [[Downtown New Haven]] at an interchange with [[Interstate 95|I-95]] ([[Connecticut Turnpike]]). At the bottom of the ramp for exit 5, [[U.S. Route 5|US 5]] begins at the first of its many interchanges with the freeway.<ref name="log" /> Leaving New Haven, I-91 follows a northeastward trek into [[North Haven, Connecticut|North Haven]], where it meets the southern end of the [[Connecticut Route 40|Route 40]] expressway.<ref>{{cite web |author = Connecticut Department of Transportation |title = ConnDOT: Nighttime Installation of Rumble Strips on Route 40 in North Haven and Hamden and I-91 in Wallingford |url = http://www.ct.gov/dot/cwp/view.asp?a=2135&Q=586840 |publisher = Connecticut Department of Transportation |access-date = August 10, 2018 |language = en-us |archive-date = August 10, 2018 |archive-url = https://web.archive.org/web/20180810174602/http://www.ct.gov/dot/cwp/view.asp?a=2135&Q=586840 |url-status = live }}</ref> It travels through the eastern part of [[Wallingford, Connecticut|Wallingford]] before entering the eastern part of the city of [[Meriden, Connecticut|Meriden]]. In Meriden, about halfway between Hartford and New Haven, I-91 sees a complex set of interchanges with the [[Wilbur Cross Parkway]] ([[Connecticut Route 15|Route 15]]), the [[Connecticut Route 66|Route 66]] expressway, and its first spur route, [[Interstate 691|I-691]].<ref name="log" /> I-691 provides a westward link to I-84 and the city of [[Waterbury, Connecticut|Waterbury]].<ref name="log" /> Leaving Meriden, I-91 enters [[Middlesex County, Connecticut|Middlesex County]] as it briefly travels through the western part of [[Middletown, Connecticut|Middletown]] before entering [[Cromwell, Connecticut|Cromwell]], where it has an interchange with the [[Connecticut Route 9|Route 9]] expressway.<ref>{{google maps |title = Route 9 Interchange |url = https://www.google.com/maps/@41.623818,-72.6974995,4806m/data=!3m1!1e3 |access-date = August 10, 2018 |link = no }}</ref><ref name="ex">{{cite web |title = Interchanges |url = http://ctps.org/pub/Express_Highway_Count_Locations/25_I_91.pdf |access-date = August 10, 2018 |website = ctps.org |publisher = Boston region Metropolitan Planning Organization |archive-date = December 29, 2019 |archive-url = https://web.archive.org/web/20191229065242/https://www.ctps.org/pub/Express_Highway_Count_Locations/25_I_91.pdf |url-status = live }}</ref> It then enters [[Hartford County, Connecticut|Hartford County]] in the town of [[Rocky Hill, Connecticut|Rocky Hill]] and then enters Wethersfield, meeting the [[Connecticut Route 3|Route 3]] expressway, which leads to [[Glastonbury, Connecticut|Glastonbury]] and the [[Connecticut Route 2|Route 2]] expressway via the [[William H. Putnam Memorial Bridge]] over the [[Connecticut River]]. From there to [[St. Johnsbury, Vermont]], I-91 parallels the river, never more than {{convert|5|mi|km|spell=in}} from its west bank.<ref>{{cite web |title = Interstate Route I-91 Corridor Planning Study |url = http://www.pvpc.org/sites/default/files/I91ExistingConditionsE1toE5July15.pdf |access-date = August 10, 2018 |website = pvpc.org |publisher = Pioneer Valley Planning Commission |archive-date = August 11, 2018 |archive-url = https://web.archive.org/web/20180811031813/http://www.pvpc.org/sites/default/files/I91ExistingConditionsE1toE5July15.pdf |url-status = live }}</ref> I-91 then enters the [[Hartford, Connecticut|Hartford]] city limits; in that city, it has a set of interchanges with US 5/Route 15 ([[Wilbur Cross Highway]]), which provides access from I-91 north to I-84 east, and from I-84 west to I-91 south via the [[Charter Oak Bridge]].<ref>{{cite web |author = Connecticut Department of Transportation |title = Department of Transportation Event Detail |url = http://www.ct.gov/dot/ical/eventDetail_page.asp?date_ID=C9C8CAC6C983CDC8CC |publisher = The State of Connecticut |access-date = August 10, 2018 |language = en-us |website = www.ct.gov |archive-date = August 11, 2018 |archive-url = https://web.archive.org/web/20180811031737/http://www.ct.gov/dot/ical/eventDetail_page.asp?date_ID=C9C8CAC6C983CDC8CC |url-status = live }}</ref> I-91 then has an interchange with I-84, where all other transitions to and from I-84 take place. Before leaving the city limits, a [[high-occupancy vehicle lane]] begins that has its own set of interchanges up to exit 38.<ref>{{cite web |first1 = Mark |last1 = Glaze |first2 = Karen |last2 = Perritt |date = June 28, 2017 |title = I-84 HOV Lanes-Hartford, Connecticut |url = https://www.fhwa.dot.gov/Environment/air_quality/cmaq/research/advancing_mobility/03cmaq05.cfm |publisher = Federal Highway Administration |access-date = August 15, 2018 |language = en |archive-date = August 15, 2018 |archive-url = https://web.archive.org/web/20180815232832/https://www.fhwa.dot.gov/Environment/air_quality/cmaq/research/advancing_mobility/03cmaq05.cfm |url-status = live }}</ref> I-91 then enters [[Windsor, Connecticut|Windsor]] and meets the western end of its other Connecticut spur route, [[Interstate 291 (Connecticut)|I-291]]. At the Windsor–[[Windsor Locks, Connecticut|Windsor Locks]] town line, it meets the eastern terminus of the [[Connecticut Route 20|Route 20]] expressway, which provides direct access to [[Bradley International Airport]].<ref name="impact" /> A couple of miles further north, I-91 crosses the Connecticut River on the [[Dexter Coffin Bridge]] into [[East Windsor, Connecticut|East Windsor]]. After traveling through East Windsor and [[Enfield, Connecticut|Enfield]], it crosses the state line, at milepost 58, into [[Longmeadow, Massachusetts]].<ref name="log">{{cite web |url = http://www.ct.gov/dot/LIB/dot/Documents/dpolicy/hwylog/hwylog.pdf |title = Highway Log |publisher = Connecticut Department of Transportation |access-date = August 21, 2016 |url-status = dead |archive-url = https://web.archive.org/web/20150905063334/http://www.ct.gov/dot/LIB/dot/Documents/dpolicy/hwylog/hwylog.pdf |archive-date = September 5, 2015 }}</ref> === Massachusetts === I-91 extends {{convert|55|mi|km}} through the [[Pioneer Valley]] of western Massachusetts paralleling the [[Connecticut River]].<ref name="mass">{{cite book |last1 = Olia |first1 = Maria |title = Insiders' Guide to Massachusetts |date = 2013 |publisher = Rowman & Littlefield |isbn = 978-1-4930-0163-7 |url = https://books.google.com/books?id=7doPAQAAQBAJ&pg=PA1 |access-date = August 10, 2018 |via = Google Bools |language = en |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200614/https://books.google.com/books?id=7doPAQAAQBAJ&pg=PA1 |url-status = live }}</ref> I-91 serves as the major transportation corridor through three Massachusetts counties, linking the cities of [[Springfield, Massachusetts|Springfield]], [[Northampton, Massachusetts|Northampton]], and [[Greenfield, Massachusetts|Greenfield]].<ref name="mass" /> These three cities serve as the [[control cities]] listed on guide and mileage signs, along with [[Brattleboro, Vermont]], beginning with the first northbound conventional mileage sign ({{convert|63|mi|km|disp=sqbr}}) in Longmeadow.<ref name="MA Route Log" /> In Springfield, I-91 has an interchange with [[Interstate 291 (Massachusetts)|I-291]] at exit 6 (old exit 8), a {{convert|5.44|mi|km|adj=mid|-long}} [[Spur route|spur]] going eastbound to connect with the [[Massachusetts Turnpike]], for travelers going either east toward [[Boston]] or west toward [[Albany, New York]].<ref>{{cite web |title = I-91 Springfield viaduct project ahead of schedule |url = https://www.recorder.com/Interstate-91-project-ahead-of-schedule-14574291 |access-date = August 10, 2018 |work = Greenfield Recorder |date = January 2, 2018 |archive-date = August 11, 2018 |archive-url = https://web.archive.org/web/20180811031816/https://www.recorder.com/Interstate-91-project-ahead-of-schedule-14574291 |url-status = live }}</ref><ref>{{cite web |last1 = Fay |first1 = Tony |title = Cone Zone Alert: Interstate 91 Exit 8 |url = https://www.wwlp.com/news/cone-zone-alert-interstate-91-exit-8/1043515699 |location = Springfield, Massachusetts |publisher = [[WWLP-TV]] |access-date = August 15, 2018 |date = April 8, 2016 |archive-date = October 1, 2020 |archive-url = https://web.archive.org/web/20201001053147/https://www.wwlp.com/news/cone-zone-alert-interstate-91-exit-8/1043515699/ |url-status = live }}</ref> North of Springfield, I-91 briefly enters [[Chicopee, Massachusetts|Chicopee]], there is an interchange with its spur, [[Interstate 391|I-391]], at exit 9 (old exit 12) before turning westward to cross the Connecticut River into [[West Springfield, Massachusetts|West Springfield]]. I-391 provides direct access to [[Holyoke, Massachusetts|Holyoke]], while I-91 continues on the western side of the river.<ref name="ex" /> Just after the river crossing, exit 11 (old exit 14) is a major interchange with the [[Massachusetts Turnpike]] (I-90). Then, I-91 enters the city of Holyoke where exit 12 (old exit 15) is located. Just after an interchange with [[U.S. Route 202|US 202]], (exit 16) I-91 goes from three lanes to two lanes in each direction to the Vermont state line.<ref name="ex" /> After a short exit-less stretch, I-91 enters [[Northampton, Massachusetts|Northampton]], passing the [[Northampton Airport]] and an [[oxbow lake]]. The towns of [[Hadley, Massachusetts|Hadley]] and [[Amherst, Massachusetts|Amherst]], home to the main campus of the [[University of Massachusetts Amherst]], are accessible from I-91 exits in Northampton via [[Massachusetts Route 9|Route 9]].<ref name="ex" /> Continuing north, I-91 enters [[Hatfield, Massachusetts|Hatfield]], where it begins a straight section—nearly {{convert|6|mi|km|spell=in}} without a bend in the road. Several exits provide access to US 5 and [[Massachusetts Route 10|Route 10]] in [[Hatfield, Massachusetts|Hatfield]] and [[Whately, Massachusetts|Whately]] before entering [[Deerfield, Massachusetts|Deerfield]].<ref>{{google maps |title = I-91 to 40 Old State Rd |url = https://www.google.com/maps/dir/42.3492899,-72.641452/42.4640879,-72.616053/@42.466033,-72.5654649,11.75z/data=!4m2!4m1!3e3 |access-date = August 10, 2018 |link = no }}</ref> I-91 has two exits in [[Greenfield, Massachusetts|Greenfield]]. At exit 43 (old exit 26), the southern end of its overlap with [[Massachusetts Route 2|Route 2]], there is a rest area and visitor information center for [[Franklin County, Massachusetts|Franklin County]].<ref>{{cite web |title = Service Plaza Locations |url = https://www.mass.gov/info-details/service-plaza-locations |website = Mass.gov |access-date = August 10, 2018 |language = en |archive-date = August 9, 2018 |archive-url = https://web.archive.org/web/20180809163301/https://www.mass.gov/info-details/service-plaza-locations |url-status = live }}</ref> At exit 46 (old exit 27), also in Greenfield, is the northern end of its overlap with Route 2 where access to that road is provided via a [[directional T interchange]] and exit and entry ramps on the left side of southbound I-91. Exit 50 (old exit 28) in [[Bernardston, Massachusetts|Bernardston]] is the last exit in Massachusetts. Beyond exit 50, I-91 continues for about {{convert|5|mi|km|spell=in}} more before crossing into Vermont.<ref name="MA Route Log" /> Massachusetts is the only state traversed by I-91 where another numbered highway is [[Concurrency (road)|concurrent]] with the Interstate (in this case, US 5, for a {{convert|0.5|mi|km|adj=on}} spur near the Springfield–Longmeadow town line and Route 2, for approximately {{convert|3|mi|km|spell=in}} in Greenfield).<ref>{{cite web |url = http://ctps.org/pub/Express_Highway_Count_Locations/25_I_91.pdf |title = Concurrent Roads |publisher = ctps.org |access-date = December 29, 2017 |archive-date = December 29, 2019 |archive-url = https://web.archive.org/web/20191229065242/https://www.ctps.org/pub/Express_Highway_Count_Locations/25_I_91.pdf |url-status = live }}</ref> === Vermont === I-91 traverses the entire length of [[Vermont]] and serves as a major transportation corridor for eastern Vermont and western [[New Hampshire]]. Due to its routing along the Connecticut River separating the two states, many exits along Vermont's length of I-91 feature New Hampshire towns on the guide signs (for example, exit 3, which lists [[Brattleboro, Vermont|Brattleboro]] and [[Keene, New Hampshire]], as the points of access). The length of I-91 within Vermont is {{convert|177|mi|km}} and has two lanes in each direction the entire way from the Massachusetts state line to the Canada–United States border (nearly two-thirds of I-91's length) with 29 Vermont interchanges. The highway's rural character and long distances between exits in Vermont are in stark contrast to its south, where exits are more frequent and the road carries four lanes of traffic in each direction at some points. The major control cities in Vermont are Brattleboro, [[White River Junction, Vermont|White River Junction]], [[St. Johnsbury, Vermont|St. Johnsbury]], and [[Newport (city), Vermont|Newport]]. When entering northbound I-91 at exit 28 in [[Derby, Vermont|Derby]], the control city sign is for Canada. Of these destinations, only Newport is a city, although the other towns are sizable. In general, the road parallels its predecessor, US 5.<ref>{{google maps |link = no |url=https://www.google.com/maps/dir/42.730126,-72.5698703/45.0058814,-72.0876317/@45.0062274,-72.0894927,17.96z|title=Interstate 91 in Vermont|access-date=August 13, 2019}}</ref><ref>{{cite book |last1 = Tree |first1 = Christina |last2 = Foulds |first2 = Diane E. |title = Explorer's Guide Vermont |date = 2009 |publisher = The Countryman Press |isbn = 9780881508482 |url = https://books.google.com/books?id=MvkoQmVCQlMC&pg=PA238 |access-date = 17 August 2019 |language = en |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200615/https://books.google.com/books?id=MvkoQmVCQlMC&pg=PA238 |url-status = live }}</ref><ref>{{cite book |last1 = Tree |first1 = Christina |last2 = Hamm |first2 = Christine |last3 = Imbrie |first3 = Katherine |title = Explorer's Guide New Hampshire |date = 2010 |publisher = The Countryman Press |isbn = 9780881508413 |url = https://books.google.com/books?id=QpvEeOtVBXsC&pg=PA194 |access-date = 17 August 2019 |language = en |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200615/https://books.google.com/books?id=QpvEeOtVBXsC&pg=PA194 |url-status = live }}</ref> I-91 enters Vermont in the town of Guilford. Just before exit 1 in Brattleboro is the Vermont Welcome Center in Guilford. The first three Vermont exits (northbound) serve the town of Brattleboro. At exit 1, northbound US 5 provides access to stores and a small industrial area before reaching the south end of the town's center, where a bridge crosses the Connecticut River into [[Hinsdale, New Hampshire]], via [[New Hampshire Route 119|New Hampshire Route 119]] (NH 119). Exit 2 ([[Vermont Route 9|Vermont Route 9]] [VT 9]) provides access to the western village of the town ([[West Brattleboro, Vermont|West Brattleboro]]), then continues west to [[Marlboro, Vermont|Marlboro]], [[Wilmington, Vermont|Wilmington]], and [[Bennington, Vermont|Bennington]]. Brattleboro's main retail strip is located at and just south of the exit 3 [[trumpet interchange]] and [[traffic circle]]. Following VT 9 eastward, one can reach Keene, New Hampshire, in {{convert|15|mi|km}}.<ref>{{google maps |link = no |url=https://www.google.com/maps/dir/42.7301196,-72.5698914/42.8877316,-72.5574336/@42.8392807,-72.6087066,11.03z|title=Vermont Border to Franklin Pierce Highway|access-date=August 13, 2019}}</ref><ref name="ma"/> After exit 3, I-91 heads north to travel through the communities of [[Dummerston, Vermont|Dummerston]], [[Putney, Vermont|Putney]], [[Westminster (town), Vermont|Westminster]], [[North Westminster, Vermont|North Westminster]], [[Bellows Falls, Vermont|Bellows Falls]], [[Springfield, Vermont|Springfield]], [[Weathersfield, Vermont|Weathersfield]], [[Windsor, Vermont|Windsor]], [[Hartland, Vermont|Hartland]], [[North Hartland, Vermont|North Hartland]] and White River Junction. White River Junction, listed as a control city on mileage signs as far south as [[Greenfield, Massachusetts]], is where I-91 and [[Interstate 89|I-89]] meet and provide access to many points in Vermont and New Hampshire, at exit 10.<ref>{{google maps |link = no |title=I-91 to I-91 |url=https://www.google.com/maps/dir/42.886515,-72.5584131/43.6324333,-72.3396066/@43.2591536,-73.0094103,172372m/data=!3m2!1e3!4b1!4m2!4m1!3e0 |access-date=August 15, 2018}}</ref> North of the interchange with I-89, I-91 continues toward St. Johnsbury and travels through [[Wilder, Vermont|Wilder]] and [[Norwich, Vermont|Norwich]]. It enters [[Orange County, Vermont|Orange County]], passing through [[Thetford, Vermont|Thetford]], [[Fairlee, Vermont|Fairlee]], [[Bradford, Vermont|Bradford]], [[Newbury (village), Vermont|Newbury]], and [[Wells River, Vermont|Wells River]]. It continues into the [[Caledonia County, Vermont|Caledonia County]] communities of [[Ryegate, Vermont|Ryegate]], [[Barnet, Vermont|Barnet]] and [[Waterford, Vermont|Waterford]], before coming to its next major intersection in St. Johnsbury at the northern terminus of [[Interstate 93|I-93]], providing access to the [[White Mountains (New Hampshire)|White Mountains]] of New Hampshire and the [[Greater Boston]] area. Along this stretch of highway between White River Junction and St. Johnsbury, towns in [[Grafton County, New Hampshire]], on the other side of the river can also be easily accessed. Just after exit 19, there are three exits for St. Johnsbury, including a major intersection with [[U.S. Route 2|US 2]]. Along westbound US 2, the capital of Vermont, [[Montpelier, Vermont|Montpelier]], is eventually reached from I-91, although I-89 provides Montpelier with immediate Interstate access.<ref>{{cite book |last1 = Halvorsen |first1 = Lisa |last2 = O'Brien |first2 = Pat Goudey |last3 = Tree |first3 = Christina |title = Explorer's Guide Vermont |date = 2018 |publisher = The Countryman Press |isbn = 9781682681671 |url = https://books.google.com/books?id=HA1rDwAAQBAJ&pg=PT219 |access-date = 17 August 2019 |language = en |edition = Fifteenth |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200615/https://books.google.com/books?id=HA1rDwAAQBAJ&pg=PT219 |url-status = live }}</ref><ref>{{google maps |link = no |url=https://www.google.com/maps/dir/43.6427089,-72.3381545/44.4314426,-72.0341872/@44.0948183,-72.4280079,9.95z/data=!4m2!4m1!3e0|title=White River Junction to St. Johnsbury|access-date=August 13, 2019}}</ref> I-91 continues northward, now following the [[Passumpsic River]] valley. It travels through Vermont's [[Northeast Kingdom]] region and the town of [[Lyndon, Vermont|Lyndon]]. Two exits in Lyndon serve the village of [[Lyndonville, Vermont|Lyndonville]] and [[Lyndon State College]]. After exit 24, I-91 departs US 5, which it had been closely paralleling since the Massachusetts state line. I-91 follows the valley of Miller Run,<ref>{{cite web |title = Passumpsic River Valley |url = http://dec.vermont.gov/sites/dec/files/documents/WSMD_mp_Passumpsicassessmntrpt_Jun2009.pdf |access-date = August 10, 2018 |website = dec.vermont.gov |publisher = Vermont Department of Environmental Conservation |archive-date = May 15, 2017 |archive-url = https://web.archive.org/web/20170515002924/http://dec.vermont.gov/sites/dec/files/documents/WSMD_mp_Passumpsicassessmntrpt_Jun2009.pdf |url-status = live }}</ref><ref group=lower-alpha>Miller Run feeds southeast into the Passumpsic River.</ref> and there are no convenient services until Barton at exit 25.<ref>{{cite web |title = Trucker's Exit Guide to Interstate 91 |url = http://www.truckerguide.com/assets/vermonti-91.pdf |website = truckerguide.com |publisher = Trucker Guide Inc. |access-date = August 10, 2018 |archive-date = June 26, 2015 |archive-url = https://web.archive.org/web/20150626224106/http://www.truckerguide.com/assets/vermonti-91.pdf |url-status = dead }}</ref> The Interstate proceeds through [[Sheffield, Vermont|Sheffield]]. Here, it reaches the highest point on the road, just north of milemarker 150 on Sheffield Heights, elevation {{convert|1856|ft|m}}.<ref>{{cite web |title = Highest Elevation on I-91 - Sheffield, Vermont - Elevation Signs on Waymarking.com |url = http://www.waymarking.com/waymarks/WM42KD_Highest_Elevation_on_I_91_Sheffield_Vermont |website = www.waymarking.com |publisher = Waymarking |access-date = August 15, 2018 |language = en |archive-date = August 16, 2018 |archive-url = https://web.archive.org/web/20180816025516/http://www.waymarking.com/waymarks/WM42KD_Highest_Elevation_on_I_91_Sheffield_Vermont |url-status = live }}</ref> After leaving Sheffield Heights, it enters [[Orleans County, Vermont|Orleans County]] and follows the [[Barton River (Vermont)|Barton River]] valley north with exits in [[Barton, Vermont|Barton]], [[Orleans, Vermont|Orleans]], and [[Derby, Vermont|Derby]]. Exit 29 is the final US exit on I-91 just after milemarker 177 at Derby Line. Beyond the exit ramp, northbound motorists enter [[Canada Customs]] at [[Stanstead, Quebec]], and continue into Canada on [[Quebec Autoroute 55]] through the [[Eastern Townships]].<ref>{{google maps |link = no |title=I-91 to 1 Autoroute 55 |url=https://www.google.com/maps/dir/44.7327932,-72.1804657/45.0058392,-72.0877147/@45.0029532,-72.0893038,702m/data=!3m1!1e3!4m2!4m1!3e0 |access-date=August 15, 2018 }}</ref><ref name="ma">{{cite web |title = Vermont I-91 Exits |url = http://vtransmaps.vermont.gov/staticmaps/VermontExits.pdf |website = vtransmaps.vermont.gov |publisher = Vermont Transportation |access-date = August 15, 2018 |archive-date = May 19, 2017 |archive-url = https://web.archive.org/web/20170519135023/http://vtransmaps.vermont.gov/staticMaps/VermontExits.pdf |url-status = live }}</ref> As with Connecticut and Massachusetts, US 5 closely parallels I-91 for their entire lengths in Vermont. While paralleling I-91 in Vermont, US 5 is never concurrent with the freeway but remains its own two-lane road, except for a portion in White River Junction where it is a four-lane divided surface arterial.<ref>{{cite book |last1 = Stallings |first1 = Doug |title = Fodor's Where to Weekend Around Boston, 1st Edition |date = 2004 |publisher = Fodor's Travel Publications |isbn = 9781400013012 |page = 197 |url = https://books.google.com/books?id=JZM4nng7cr0C&pg=PA197 |access-date = August 15, 2018 |language = en |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200617/https://books.google.com/books?id=JZM4nng7cr0C&pg=PA197 |url-status = live }}</ref><ref>{{google maps |link = no |title=I-91 to 1 Autoroute 55 Route 5 Parallel |url=https://www.google.com/maps/dir/42.7301409,-72.5698151/45.0058777,-72.0877435/@45.0048327,-72.090154,554m/data=!3m1!1e3!4m2!4m1!3e0|access-date=August 15, 2018}}</ref> Traffic and the population of each successive town tend to diminish as the road proceeds northward. The average daily traffic count for 2015 in Vermont were—St. Johnsbury (34,000), Lyndon (17,900), Barton (13,500), and Derby (Canada–United States border) (10,300).<ref name="AA-IG">{{cite web |url = http://vtrans.vermont.gov/sites/aot/files/planning/documents/trafficresearch/FinalWebRev.pdf |title = Interstate 91 Traffic Statistics |website = vtrans.vermont.gov |publisher = Vermont Agency of Transportation |access-date = August 12, 2018 |archive-date = August 15, 2018 |archive-url = https://web.archive.org/web/20180815232849/http://vtrans.vermont.gov/sites/aot/files/planning/documents/trafficresearch/FinalWebRev.pdf |url-status = live }}</ref><gallery mode="packed" widths="245" heights="175" perrow="4" caption="Interstate 91"> File:Yale University I-91.jpg|alt=A series of highway ramps with multiple cars on them. A body of water is next to them, and they are surrounded by buildings.|The beginning of I-91 in [[New Haven, Connecticut]] File:2016-09-03 08 43 40 View north along Interstate 91 at Exit 32 (Trumball Street-Interstate 84) in Hartford, Hartford County, Connecticut.jpg|I-91 north at exit 32 (I-84 west) in [[Hartford, Connecticut]] File:I91 Connecticut.jpg|alt=Both sides of a highway with a grass plot in the middle of the roads. Street lamps surround the middle, and several cars are on the roads. The roads have an HOV diamond on them.|I-91 has an [[HOV lane]] between [[Hartford, Connecticut|Hartford]] and [[Windsor, Connecticut|Windsor]], [[Connecticut]]. File:I-91-Vermont.JPG|alt=A four-lane highway in snowy weather, curving left with several cars on it. An exit sign and mountains are in the distance.|I-91 looking northbound in [[Brattleboro, Vermont]] File:I91 rockingham vt 20081220.jpg|alt=A snowy highway road that is icy and looking toward forests and mountains.|Northbound I-91 just north of exit 6 in [[Rockingham, Vermont]] File:I-91 in Wheelock VT.jpg|alt=A four-lane highway in the woods looking toward mountains on a sunny day.|Southbound I-91 in [[Wheelock, Vermont]] </gallery>
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