Interstate 68

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Interstate 68 marker

Interstate 68
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Route information
Maintained by WVDOH and MDSHA
Length: 112.9 mi[1][2] (181.7 km)
Existed: 1991 – present
Historic National Road
Mountain Maryland Scenic Byway
Major junctions
West end: I‑79 in Morgantown, WV
  US 119 in Morgantown, WV

WV 43 near Morgantown, WV
US 40 / US 219 near Grantsville, MD

US 220 near Cumberland, MD
East end: I-70 / US 40 / US 522 in Hancock, MD
States: West Virginia, Maryland
Counties: WV: Monongalia, Preston
MD: Garrett, Allegany, Washington
Highway system
MD 67 MD MD 68
WV 67 WV WV 68 x20px

Interstate 68 (I-68) is a 112.9-mile (181.7 km) Interstate highway in the U.S. states of West Virginia and Maryland, connecting Interstate 79 in Morgantown to Interstate 70 in Hancock. I-68 is also Corridor E of the Appalachian Development Highway System. From 1965 until the freeway's construction was completed in 1991, it was designated as U.S. Route 48 (US 48). In Maryland, the highway is known as the National Freeway, an homage to the historic National Road, which I-68 parallels between Keysers Ridge and Hancock. The freeway mainly spans rural areas and crosses numerous mountain ridges along its route. A road cut at Sideling Hill exposed geological features of the mountain and has become a tourist attraction.

The construction of I-68 began in 1965 and continued for over 25 years, with completion on August 2, 1991. While the road was under construction, it was predicted that economic conditions would improve along the corridor for the five counties connected by I-68: Allegany, Garrett, and Washington in Maryland, and Preston and Monongalia in West Virginia. The two largest cities connected by the highway are Morgantown, West Virginia and Cumberland, Maryland. Despite the fact that the freeway serves no major metropolitan areas, I-68 provides a major transportation route in western Maryland and northern West Virginia and also provides an alternative to the Pennsylvania Turnpike for westbound traffic from Washington, D.C. and Baltimore.

US 219 and US 220 overlap with I-68 in Garrett County, Maryland and Cumberland, Maryland, respectively, and US 40 overlaps with the freeway from Keysers Ridge to the eastern end of the freeway at Hancock.



Prior to the construction of the freeway from Morgantown to Hancock, several different routes carried traffic across the region. West Virginia Route 73 extended from Bridgeport to Bruceton Mills, serving regions now served by Interstate 79 (Bridgeport to Morgantown) and Interstate 68 (Morgantown to Bruceton Mills). After the I-68 freeway, then known as US 48, was completed in West Virginia, the WV 73 designation was removed. Portions of the road still exist as County Routes 73, 73/73, and 857. Between I-68's exit 10 at Cheat Lake and exit 15 at Coopers Rock, I-68 was largely built directly over old WV 73's roadbed.

At Bruceton Mills, WV 73 ended at WV 26, which from there runs northeast into Pennsylvania, becoming Pennsylvania Route 281 at the state line and meeting US 40 north of the border. From there eastbound traffic would follow US 40 into Maryland. I-68 now parallels US 40 through western Maryland.[3]

US 40 followed the route of the National Road through Pennsylvania and Maryland. The National Road was the first federally funded road built in the United States, authorized by Congress in 1806. Construction lasted from 1811 to 1837, establishing a road that extended from Cumberland to Vandalia, Illinois. Upon the establishment of the U.S. Highway system in 1926, the route of the National Road became part of U.S. Route 40.[4]

A highway bridge passes above a creek, with a railroad bridge visible in the background.
The Cumberland Thruway bridge, as seen from the Baltimore Street bridge over Wills Creek in Cumberland

Cumberland Thruway

In the early 1960s, as the Interstate Highway System was being built throughout the United States, east-west travel through western Maryland was difficult, as US 40, the predecessor to I-68, was a two-lane country road with steep grades and hairpin turns.[5] In Cumberland, the traffic situation was particularly problematic, as the usage of US 40 exceeded the capacity of the city's narrow streets.[5] Traffic following US 40 through Cumberland entered through the Cumberland Narrows and followed Henderson Avenue to Baltimore Avenue. After the construction of I-68, this route through Cumberland became U.S. Route 40 Alternate.[2]

Construction began on one of the first sections of what would become I-68, the Cumberland Thruway, on June 10, 1965.[6] This portion of the highway, which consists of a mile-long elevated bridge, was completed and opened to the public on December 5, 1966.[7] The elevated highway connected Lee Street in west Cumberland to Maryland Avenue in east Cumberland, providing a quicker path for motorists traveling through the town on US 40 and US 220. The Cumberland Thruway was extended to US 220 and then to Vocke Road (Maryland Route 658) by 1970.[8][9] Problems quickly emerged with the highway, especially near an area called "Moose Curve." At Moose Curve, the road curves sharply at the bottom of Haystack Mountain, and traffic accidents are common.[10]

Corridor E

U.S. Route 48
Location: Morgantown, West Virginia – Hancock, Maryland
Existed: 1965–1991

In 1965, the Appalachian Development Act was passed, authorizing the establishment of the Appalachian Development Highway System, which was meant to provide access to areas throughout the Appalachian Mountains that were not previously served by the Interstate Highway System. A set of corridors was defined, comprising 3,090 miles (4,970 km) of highways from New York to Mississippi. Corridor E in this system was defined to have endpoints at I-79 in Morgantown, West Virginia and I-70 in Hancock, Maryland. At the time, there were no freeways along the corridor, though construction on the Cumberland Thruway began that year.[6][11] It was this corridor that would eventually become I-68.[12]

The construction of Corridor E, which was also designated as US 48, took over 20 years and hundreds of millions of dollars to complete. The cost of completing the freeway in West Virginia has been estimated at $113 million (equivalent to $Error when using {{Inflation}}: |index=US-NGDPPC (parameter 1) not a recognized index. million in 2015[13])[14] The cost of building I-68 from Cumberland to the West Virginia state line came to $126 million ($Error when using {{Inflation}}: |index=US-NGDPPC (parameter 1) not a recognized index. million in 2015[13]); the portion between Cumberland and Sideling Hill cost $182 million ($Error when using {{Inflation}}: |index=US-NGDPPC (parameter 1) not a recognized index. million in 2015[13]); and the section at Sideling Hill cost $44 million ($Error when using {{Inflation}}: |index=US-NGDPPC (parameter 1) not a recognized index. million in 2015[13]).[5]

Much of the work in building the freeway was completed during the 1970s, with US 48 being opened from Vocke Road in LaVale to Maryland Route 36 in Frostburg on October 12, 1973, and to Maryland Route 546 on November 1, 1974.[5][15] On November 15, 1975, the West Virginia portion and a 14-mile (23 km) portion from the West Virginia state line to Keysers Ridge in Maryland opened, followed by the remainder of the freeway in Garrett County on August 13, 1976.[5]

In the 1980s, the focus of construction shifted to the east of Cumberland, where a 19-mile (31 km) section of the road still had not been completed. The first corridor for the construction to be approved by the Maryland State Highway Administration (MDSHA) ran south of U.S. Route 40. This corridor would have bypassed towns in eastern Allegany County such as Flintstone, leaving them without access to the freeway, and would have passed directly through Green Ridge State Forest, the largest state forest in Maryland. This proposed corridor provoked strong opposition, largely due to the environmental damage that would be caused by the road construction in Green Ridge State Forest. Environmental groups sued MDSHA in order to halt the planned construction, but the court ruled in favor of the State Highway Administration. In 1984, however, MDSHA reversed its earlier decision and chose an alignment that closely paralleled US 40, passing through Flintstone and to the north of Green Ridge State Forest. Construction on the final section of I-68 began May 25, 1987, and was completed on August 2, 1991.[5][16]

Designation as I-68

A four-lane highway descending a hill, with more hills visible in the background.
View heading east, 18 miles (29 km) from Cumberland, MD

Though the National Freeway was designated as US 48, as the completion of the freeway neared, the possibility of the freeway being designated as an Interstate highway came up. In the 1980s, the project to improve U.S. Route 50 between Washington, D.C. and Annapolis to Interstate highway standards had been assigned the designation of I-68. MDSHA, however, later concluded that adding additional route shields to the US 50 freeway would not be helpful to drivers, since about half the freeway already had two route designations (US 50 and US 301) and drivers on the freeway were already familiar with the US 50 designation.[17] This made the designation to be applied to that freeway more flexible, and so in 1989, the American Association of State Highway and Transportation Officials (AASHTO), the organization composed of the various state departments of transportation that decides route numbering in the United States, approved MDSHA's request to renumber the US 50 freeway from I-68 to Interstate 595.[18] That same year, AASHTO approved changing US 48's designation to I-68.[18] This change took effect upon the completion of the last section of the National Freeway, on August 2, 1991.[5]

With the completion of I-68 and the change in its route number, the US 48 designation was removed. In 2002, AASHTO approved the establishment of a new US 48, this time for the Corridor H highway from Weston, West Virginia to Strasburg, Virginia.[19] This marks the third time that the US 48 number has been assigned to a highway, the first use being for a highway in California that existed in the 1920s.[20]


Numerous accidents and incidents have occurred on I-68. On June 1, 1991, a gasoline tanker descending into downtown Cumberland from the east attempted to exit the freeway at exit 43D, Maryland Avenue. The tanker went out of control and overturned as the driver tried to go around the sharp turn at the exit. Gasoline began to leak from the damaged tanker, forcing the evacuation of a three-block area of Cumberland. Approximately 30 minutes later, the tanker exploded, setting eight houses on fire. The fire caused an estimated $250,000 in damages (equivalent to $Error when using {{Inflation}}: |index=US-NGDPPC (parameter 1) not a recognized index.,000 in 2015[13]), and prompted MDSHA to place signs prohibiting hazardous materials trucks from exiting at the Maryland Avenue exit.[21][22][23]

On May 23, 2003, poor visibility due to fog was a major contributing factor to an 85-vehicle pileup on I-68 on Savage Mountain west of Frostburg. Two people were killed and nearly 100 people were injured. Because of the extent of the wreckage on the road, I-68 remained blocked for 24 hours while the wreckage was cleared.[24] In the aftermath of the pileup, the question of how to deal with fog in the future was discussed. Though the cost of a fog warning system can be considerable, MDSHA installed such a system in 2005 at a cost of $230,000 ($Error when using {{Inflation}}: |index=US-NGDPPC (parameter 1) not a recognized index.,000 in 2015[13]).[25][26] The system alerts drivers when visibility drops below 1,000 feet (300 m).[26]

Effect on surrounding region

A small town is seen below a mountain ridge which contains a deep V-shaped cut.
The Sideling Hill road cut, photographed from Interstate 70 east of the mountain

One of the arguments in favor of the construction of I-68 was that the freeway would improve the poor economic conditions in western Maryland. The economy of the surrounding area has improved since the construction of the freeway, especially in Garrett County, where the freeway opened up the county to tourism from Washington, D.C. and Baltimore. Correspondingly, Garrett County saw a sharp increase in population and employment during and after the construction of the road, with full- and part-time employment increasing from 8,868 in 1976 to 15,334 in 1991.[27] However, economic difficulties remain in Allegany and Garrett counties.[28] There were concerns over loss of customers to businesses that have been cut off from the main highway due to the construction of the new alignment in the 1980s, leading to protests when then-Governor Harry Hughes visited the Sideling Hill road cut when it was opened.[29]

Proposed extension

In the 1990s, there was discussion about a future westward extension to I-68. Such an extension would connect the western terminus of I-68 in Morgantown to West Virginia Route 2 (WV 2) in Moundsville. A 1989 proposal had suggested a toll road be built along this corridor.[30] In 2003, the Federal Highway Administration approved the extension, paving the way for federal funding and for the road to become part of the National Highway System on completion.[1] However, the project ran into problems due to lack of funds, and in 2008, West Virginia Governor Joe Manchin suggested dropping the project altogether, making construction of a westward extension of I-68 unlikely in the near future.[31]

On September 15, 2014, Marshall County officials brought the extension of I-68 up again as a way for oil companies to have easier access to drill into the area, likely by fracking. Much like the second leg of the Southern Beltway in the Pittsburgh area, an extension of I-68 is being spurred in response to the Marcellus natural gas trend. If the extension were to be built, it would also include a widening of WV 2 to four lanes and would cost an estimated $5 million per mile. It is expected that the project would be divided into two legs, first from Morgantown to Cameron, then Cameron to Moundsville.[32]

In May 2015, Maryland passed a law to increase the state's maximum speed limit. The speed limit was changed from 65 to 70 miles per hour (105 to 113 km/h). October 1 of the same year, this law was put into effect, making I-68's speed limit 70 mph except for the Cumberland area. Other Interstates in Maryland could also have their speed limit raised.[33] West Virginia's speed limit is already 70 mph.

Route description

I-68 spans 112.6 miles (181.2 km)—81.1 miles (130.5 km) in Maryland and 31.5 miles (50.7 km) in West Virginia—connecting I-79 in Morgantown, West Virginia to I-70 in Hancock, Maryland, across the Appalachian Mountains. The control cities—the cities officially chosen to be the destinations shown on guide signs—for I-68 are Morgantown, Cumberland, and Hancock.[34] I-68 is the main route connecting western Maryland to the rest of Maryland. I-68 is also advertised to drivers on I-70 as an "alternate route to Ohio and points west" by the Maryland State Highway Administration.[35]

West Virginia

A sign above the highway reads "Welcome to West Virginia—Open For Business." An adjacent sign reads "Preston County."
I-68 at the West Virginia–Maryland state line

I-68 begins at interchange 148 on I-79 near Morgantown and runs eastward, meeting with US 119 one mile (1.6 km) east of its terminus at I-79. I-68 turns northeastward, curving around Morgantown, with four interchanges in the Morgantown area—I-79, US 119, West Virginia Route 7, and West Virginia Route 705. Leaving the Morgantown area, I-68 again runs eastward, interchanging with West Virginia Route 43, which provides access to Cheat Lake and Uniontown, Pennsylvania. Near this interchange, I-68 passes over Cheat Lake and climbs a steep ascent out of Cheat Canyon.[36]

Entering Preston County, the route interchanges with County Route 73/12, which provides access to Coopers Rock State Forest. In contrast to the Morgantown area, the portion of Preston County that I-68 crosses is more rural, with the only town along the route being Bruceton Mills. In Bruceton Mills, I-68 meets West Virginia Route 26. I-68 meets County Route 5 (Hazleton Road) at its last exit before entering Garrett County, Maryland.[36]

The region of West Virginia through which the freeway passes is rural and mountainous. There are several sections that have steep grades, especially near the Cheat River Canyon, where there is a truck escape ramp in case trucks lose their brakes descending the steep grade.[37]

The peak traffic density on Interstate 68 in West Virginia is 32,900 average annual daily traffic at the interchange with I-79 in Morgantown. The traffic gradually decreases further eastward, reaching a low point at 14,600 cars per day at the Hazleton exit.[38]


A sign adjacent to a four-lane highway reads "Maryland welcomes you. Enjoy your visit! Martin O'Malley, Governor"
Entering Maryland from West Virginia on I-68 East towards Cumberland

After entering Garrett County, I-68 continues its run through rural areas, crossing the northern part of the county. The terrain through this area consists of ridges that extend from southwest to northeast, with I-68 crossing the ridges through its east/west run. The first exit in Maryland is at Maryland Route 42 in Friendsville. I-68 ascends Keysers Ridge, where it meets US 40 and US 219, both of which join the highway at Keysers Ridge.[2] The roadway that used to be the surface alignment of US 40 parallels I-68 to Cumberland, and is now designated as US 40 ALT. I-68 crosses Negro Mountain, which was the highest point along the historic National Road that the freeway parallels east of Keysers Ridge. This is the source of the name of the freeway in Maryland: the National Freeway.[5] Three miles (five kilometers) east of Grantsville, US 219 leaves the National Freeway to run northward towards Meyersdale, Pennsylvania, while I-68 continues eastward, crossing Savage Mountain before entering Allegany County.[2]

The section of I-68 west of Dans Mountain in Allegany County is located in the Allegheny Mountains, characterized in Garrett County by a series of uphill and downhill stretches along the freeway, each corresponding to a ridge that the freeway crosses. In Allegany County, the freeway crosses the Allegheny Front, where, from Savage Mountain to LaVale, the highway drops in elevation by 1,800 feet (550 m) in a distance of 9 miles (14 km).[39][40]

A view of a creek with a truss bridge in the near background and another bridge in the far background.
The I-68 bridge over the Casselman River near Grantsville, Maryland, with the U.S. Route 40 Alternate bridge in the foreground

The traffic density on I-68 in Garrett County is rather sparse compared to that of Allegany County. At the Maryland—West Virginia state line, there is an annual average daily traffic of 11,581. This density increases to its highest point in Garrett County at exit 22, where US 219 leaves I-68; 19,551 vehicles per day drive through this section. At the Allegany County line, the traffic density decreases slightly to 18,408. In Allegany County, the vehicle count increases to 28,861 in LaVale, and to the freeway's peak of 46,191 at the first US 220 interchange (exit 42) in Cumberland. East of Cumberland, the vehicle count decreases to 16,551 at Martins Mountain and stays nearly constant to the eastern terminus of I-68 in Hancock.[2]

After entering Allegany County, I-68 bypasses Frostburg to the south, with two exits, one to Midlothian Road (unsigned Maryland Route 736) and one to MD 36. Near the MD 36 exit is God's Ark of Safety church, which is known for its attempt to build a replica of Noah's Ark. This replica, which currently consists of a steel frame, can be seen from I-68.[41]

East of Frostburg, I-68 crosses a bridge above Spruce Hollow near Clarysville, passing over Maryland Route 55, which runs along the bottom of the valley. The freeway runs along the hillside above US 40 ALT in the valley formed by Braddock Run. Entering LaVale, I-68 has exits to US 40 ALT and MD 658 (signed southbound as U.S. Route 220 Truck). I-68 ascends Haystack Mountain, entering the city of Cumberland. This is the most congested section of the highway in Maryland. The speed limit on the highway drops from 70 miles per hour (110 km/h) in LaVale to 55 miles per hour (89 km/h) until the US 220 exit, and to 40 miles per hour (64 km/h) in downtown Cumberland.[2] This drop in the speed limit is due to several factors, including heavy congestion, closely spaced interchanges, and a sharp curve in the road, known locally as "Moose Curve," located at the bottom of Haystack Mountain. This section of the highway was originally built in the 1960s as the Cumberland Thruway, a bypass to the original path of U.S. Route 40 through Cumberland.[5]

Until 2008, signs at exit 43A in downtown Cumberland labeled the exit as providing access to West Virginia Route 28 Alternate (WV 28 ALT). Because of this, many truckers used this exit to get to West Virginia Route 28 (WV 28). This created problems on WV 28 ALT in Ridgeley, West Virginia, as trucks became stuck under a low railroad overpass, blocking traffic through Ridgeley. To reduce this problem, the Maryland State Highway Administration removed references to WV 28 ALT from guide signs for exit 43A and placed warning signs in Cumberland and on I-68 approaching Cumberland advising truckers to instead use exit 43B to Maryland Route 51, which allows them to connect to WV 28 via Virginia Avenue, bypassing the low overpass in Ridgeley.[42]

A highway passes through a cut through a mountain. The rock walls of the cut are visible above the highway.
I-68 passing through the Sideling Hill road cut

At exit 44 in east Cumberland, US 40 ALT meets the freeway and ends, and at exit 46, US 220 leaves I-68 and runs northward toward Bedford, Pennsylvania. I-68 continues across northeastern Allegany County, passing Rocky Gap State Park near exit 50. In northeastern Allegany County, the former US 40 bypassed by I-68 is designated as Maryland Route 144 (MD 144), with several exits from I-68 along the route. I-68 crosses several mountain ridges along this section of the highway, including Martins Mountain, Town Hill, and Green Ridge, and the highway passes through Green Ridge State Forest. East of Green Ridge State Forest, MD 144 ends at U.S. Route 40 Scenic (US 40 Scenic), another former section of US 40.[2]

I-68 crosses into Washington County at Sideling Hill Creek and ascends Sideling Hill. The road cut that was built into Sideling Hill for I-68 can be seen for several miles in each direction, and has become a tourist attraction as a result of the geologic structure exposed by the road cut.[43]

On the east side of Sideling Hill, I-68 again interchanges with US 40 Scenic, at its eastern terminus at Woodmont Road. Here US 40 Scenic ends at a section of MD 144 separate from the section further west. Four miles (six kilometers) east of this interchange, I-68 ends at I-70 and U.S. Route 522 in the town of Hancock.[2]

Exit list

State County Location mi[lower-alpha 1] km Exit Destinations Notes
West Virginia Monongalia Morgantown 0.0 0.0 I‑79 – Fairmont, Washington western terminus; I-79 exit 148
1.1 1.8 1 US 119 (University Avenue) – Downtown
4.0 6.4 4 WV 7 – Sabraton
6.9 11.1 7 CR 857 to WV 705 / Pierpont Road – Morgantown Municipal Airport
Cheat Lake 10.0 16.1 10 WV 43 north – Cheat Lake, Uniontown, PA Southern terminus of Mon–Fayette Expressway
Preston Pisgah 14.5 23.3 15 CR 7312 / Coopers Rock Road – Coopers Rock State Forest
Bruceton Mills 22.6 36.4 23 WV 26 – Bruceton Mills
Hazelton 28.5 45.9 29 CR 5 / Hazelton Road
West Virginia–Maryland state line
Maryland Garrett Friendsville 3.83 6.16 4 MD 42 – Friendsville
Keysers Ridge 13.82 22.24 14A US 219 south – Oakland West end of US 219 overlap
13.82 22.24 14B US 40 west – Uniontown West end of US 40 overlap
Grantsville 19.20 30.90 19 MD 495 – Grantsville, Swanton
22.26 35.82 22 US 219 north – Meyersdale East end of US 219 overlap
23.98 38.59 24 Lower New Germany Road
Finzel 29.78 47.93 29 MD 546 – Finzel
Allegany Frostburg 33.32 53.62 33 Midlothian Road (MD 736) – Frostburg
35.01 56.34 34 MD 36 – Westernport, Frostburg
LaVale 39.20 63.09 39
US 40 Alt. – La Vale
No eastbound exit
39.93 64.26 40 To US 220 south (truck route) / Vocke Road (MD 658, Campground Road) No westbound entrance
41.54 66.85 41 MD 49 / Seton Drive Westbound exit only
Cumberland 42.32 68.11 42 US 220 south / Greene Street – McCoole, Keyser West end of US 220 overlap; includes unsigned westbound exit and eastbound entrance to Fletcher Drive
43.59 70.15 43A Beall Street – Ridgeley No eastbound exit; westbound exit and entrance via right-in/right-out
Johnson Street – Ridgeley Eastbound exit and entrance; right-in/right-out
43.88 70.62 43B MD 51 (Industrial Boulevard) – Cumberland Regional Airport
43.90 70.65 43C Downtown Cumberland Eastbound entrance via exit 43B
44.22 71.17 43D Maryland Avenue Right-in/right-out; no hazardous materials on westbound exit
44.85 72.18 44
US 40 Alt. west (Baltimore Avenue) / Willow Brook Road (MD 639)
45.77 73.66 45 Hillcrest Drive (MD 952) Right-in/right-out
46.47 74.79 46 Naves Cross Road (MD 144) Westbound exit and entrance; eastbound access is at exit 47
47.17 75.91 47 US 220 north (MD 144) – Bedford East end of US 220 overlap; signed as exit 46 eastbound
Rocky Gap State Park 51.26 82.49 50 Pleasant Valley Road (MD 948D)
52.50 84.49 52 MD 144 east (National Pike) Eastbound exit and westbound entrance
Flintstone 55.95 90.04 56 MD 144 (National Pike) – Flintstone
Green Ridge State Forest 62.92 101.26 62
US 40 Scenic east / Fifteen Mile Creek Road
64.19 103.30 64 M.V. Smith Road
68.72 110.59 68 Orleans Road
71.64 115.29 72
To US 40 Scenic / High Germany Road, Swain Road
Washington 73.59 118.43 74
To US 40 Scenic east / Mountain Road
Eastbound exit and westbound entrance
Sideling Hill Cut
77.15 124.16 77
US 40 Scenic west to MD 144 / Woodmont Road
Hancock 81.09 130.50 82 I-70 / US 40 east / US 522 – Hancock, Hagerstown, Winchester, VA, Breezewood, PA East end of US 40 overlap, eastern terminus and signed as exits 82A (US 522 south), 82B (I-70 / US 40 east) and 82C (I-70 west / US 522 north); I-70 exit 1A
1.000 mi = 1.609 km; 1.000 km = 0.621 mi
  1. Mileposts and exit numbers reset at the state line.[2][37][44]

See also


  1. 1.0 1.1 Melling, Carol (October 31, 2003). "I-68 Extension Now Eligible for Federal Funding" (Press release). West Virginia Department of Transportation. Archived from the original on May 23, 2009. Retrieved January 17, 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  2. 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Highway Information Services Division (December 31, 2013). Highway Location Reference. Maryland State Highway Administration. Retrieved January 21, 2010.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  3. Staff. "Highway and Traffic Analysis" (PDF). ADHS Economic Evaluation. Appalachian Regional Commission. p. 11. Archived from the original (PDF) on April 7, 2009. Retrieved April 11, 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  4. Raitz, Karl; Thomson, George (1996). The National Road. Baltimore: Johns Hopkins University Press. p. 131. ISBN 0-8018-5155-6. Retrieved October 11, 2008.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  5. 5.0 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 "Building the National Freeway" (PDF). Maryland Roads. Maryland State Highway Administration: 5. August 2, 1991.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  6. 6.0 6.1 "Demolition in Path of Bridge to Begin". Cumberland News. June 10, 1965.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  7. "Cumberland Thruway Opened to Motorists". Cumberland News. December 5, 1966.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  8. "Next Phase of Thruway Bids Asked". Cumberland Evening Times. February 9, 1967.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  9. "New Freeway Sections Will Open Today". Cumberland News. October 18, 1969.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  10. "Transportation Department Head to Check Thruway". Cumberland Evening Times. July 28, 1972.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  11. Map of Maryland (Map). Maryland State Roads Commission. 1960. Archived from the original on February 5, 2009. Retrieved February 4, 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  12. Staff (2007). "Highway Program". Appalachian Regional Commission. Retrieved January 17, 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  13. 13.0 13.1 13.2 13.3 13.4 13.5 United States nominal Gross Domestic Product per capita figures follow the Measuring Worth series supplied in Williamson, Samuel H. (2015). "What Was the U.S. GDP Then?". MeasuringWorth. Retrieved April 15, 2015.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles> These figures follow the figures as of 2013.
  14. "I-68 Extension Gets Important Federal Endorsement". Steubenville, Ohio: WTOV-TV. September 9, 2003. Archived from the original on March 22, 2012. Retrieved January 17, 2009.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  15. "New Section of Freeway Now Open". Cumberland Evening News. October 13, 1973.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  16. Raitz, Karl; Thompson, George (1996). The National Road. Baltimore: Johns Hopkins University Press. p. 331. ISBN 0-8018-5155-6.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
  17. Shaffer, Ron (January 12, 1990). "Tunnel Visions". Washington Times.<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles>
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External links

Route map: Bing / Google