For the most part, the Interstate Highway System in the United States is a connected system, with most roads completed. The Dwight D Eisenhower National System of Interstate and Defense Highways, commonly called the Interstate Highway System (or simply the Interstate System) The United States of America —commonly referred to as the However, some Interstates still have gaps.
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True gaps
True gaps are where two sections of road are intended to be part of the same Interstate, but the two sections are not physically connected, or are only connected by non-Interstates, or are connected but the connection is not signed as part of the highway.
- Interstate 69 has two sections: the original alignment runs from Indianapolis, Indiana to Port Huron, Michigan. Interstate 69 (I-69 is an Interstate Highway in the United States. Port Huron is a city in the US state of Michigan. As of the 2000 census the city had a population of 32338 with a 2006 estimate of 31302 On October 2, 2006, a segment of I-69 opened in Tunica County, Mississippi and DeSoto County, Mississippi. Events 1187 - Siege of Jerusalem: Saladin captures Jerusalem after 88 years of Crusader rule Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. Tunica County is a County located in the Mississippi Delta region of the U DeSoto County is a County located in the US state of Mississippi. These segments will eventually be connected as I-69 is extended south to Texas. Texas ( is a state geographically located in the South Central United States and is also known as the Lone Star State.
- Interstate 74 currently has three sections, one heading west from Cincinnati, Ohio to Iowa, one from the Virginia/North Carolina state line along Interstate 77 south and east to a point southeast of Mount Airy, North Carolina, and one concurrent with the only section of I-73, from Emery, North Carolina to Ulah, North Carolina. Interstate 74 (abbreviated I-74) is an Interstate highway in the Midwestern and Southeastern United States. The State of Iowa ( is a state in the Midwestern region of the United States of America. The Commonwealth of Virginia ( is an American state North Carolina ( is a state located on the Atlantic Seaboard in the southeastern United States Interstate 77 (abbreviated I-77) is an Interstate highway in the eastern United States. Mount Airy is a city in Surry County, North Carolina, United States. Interstate 73 (abbreviated I-73) is a main route of the Interstate Highway System, currently located entirely within the U Ulah is an unincorporated community in Randolph County, south of the neighboring County seat of Asheboro North Carolina Other sections up to freeway standards are signed with I-74 shields that have FUTURE instead of INTERSTATE. Future I-73 shields are also placed along some of these sections, but only one section of I-73 is signed with normal Interstate shields.
- Interstate 95. Interstate 95 ( I-95) is the main Highway on the East Coast of the United States, paralleling the Atlantic Ocean from Maine to Probably the best-known and notoriously confusing of all the Interstate gaps, I-95 is discontinuous in Lawrence Township, New Jersey (near Trenton). Interstate 95 ( I-95) is the main Highway on the East Coast of the United States, paralleling the Atlantic Ocean from Maine to Lawrence Township is a Township in Mercer County, New Jersey, United States. Trenton is the Capital of the US state of New Jersey and the County seat of Mercer County. Coming north from Philadelphia, Pennsylvania, I-95 loops around the north side of Trenton and ends at U.S. Route 1, where it becomes I-295, which heads back south, heading to southern New Jersey. Philadelphia (ˌfɪləˈdɛlfiə US Route 1 (US 1 is a major north-south US Highway that serves the East Coast of the United States. Interstate 295 (abbreviated I-295) in New Jersey and Delaware is a bypass route from a junction with Interstate 95 south of Wilmington New Jersey ( is a state in the Mid-Atlantic and Northeastern regions of the United States. The other section of I-95 begins on the Pennsylvania Turnpike at the Pennsylvania/New Jersey state line, and heads north along the New Jersey Turnpike. The Pennsylvania Turnpike is a toll highway system operated by the Pennsylvania Turnpike Commission in the state of Pennsylvania, United States. The Commonwealth of Pennsylvania ( often colloquially referred to as PA (its abbreviation by natives and Northeasterners is a state located in the Northeastern New Jersey ( is a state in the Mid-Atlantic and Northeastern regions of the United States. The New Jersey Turnpike (or simply The Turnpike as it is known to New Jersey residents is a Toll road in New Jersey and is one of the most heavily traveled Originally I-95 was planned to have left the alignment north of Trenton and headed northeast to Interstate 287 and run east along I-287 to Exit 10 on the Turnpike, but this "Somerset Freeway" was never built. Interstate 287 (abbreviated I-287) is a major Interstate highway in New Jersey and New York. The Somerset Freeway was the planning name for an unbuilt section of Interstate 95 in central New Jersey from Hopewell Township in Mercer County Extensions over the years have taken I-95 several miles further north to the US-1 interchange northeast of Trenton, and along the New Jersey Turnpike to the Pennsylvania state line. Eventually an interchange will be built connecting the southern alignment with the Pennsylvania Turnpike, and I-95 will be rerouted via it, with the part north of that interchange becoming an extension of I-195. The Pennsylvania Turnpike/Interstate 95 Interchange Project is a project to build an interchange where Interstate 95 crosses the Pennsylvania Turnpike Interstate 195 (abbreviated I-195) is an auxiliary route of the Interstate Highway System located in the U (It was originally considered to be an extension of I-295. )
Disputed gaps
- I-90 at the Chicago Skyway — Historically the Skyway was commonly considered to be, and was signed as, part of I-90 (originally I-94). Interstate 90 (I-90 is the longest interstate highway in the United States at nearly 3100 miles (5000 kilometers The Chicago Skyway also known as Chicago Skyway Toll Bridge System is a 7 However, around 1999 the City of Chicago, Illinois determined it may never have applied for approval to sign it as an Interstate. Year 1999 ( MCMXCIX) was a Common year starting on Friday (link will display full 1999 Gregorian calendar) Chicago (ʃɪˈkɑːgoʊ is the largest City by population in the state of Illinois and the American Midwest of the United States. (It also is not designed to Interstate standards. ) The city re-signed the Skyway, and it is now mostly posted with "TO I-90" signs, with a few older signs remaining. However, the Illinois Department of Transportation has always and continues to report the Skyway as part of the Interstate system, and the Federal Highway Administration still considers it as such. The Federal Highway Administration ( FHWA) is a division of the United States Department of Transportation that specializes in Highway transportation A FHWA legal memo says "There is no doubt about it. The Chicago Skyway is officially part of I-90 that (has) always been included in the Dwight D. Eisenhower National System of Interstate and Defense Highways. "[1][2] Incidentally, this stretch of I-90 is north of I-94, contrary to the usual south-to-north numbering order.
- I-265. Interstate 265 (I-265 is an Interstate Highway ringing the Louisville Kentucky metropolitan area, which includes southern Indiana, although The Indiana portion of I-265 does not yet connect with the Kentucky portion of I-265. The State of Indiana ( was the 19th US state admitted into the union The Commonwealth of Kentucky ( is a state located in the East Central United States of America. Each of the two segments, circling the outskirts and suburbs of Louisville, ends before crossing the Ohio River. The Ohio River is the largest Tributary by volume of the Mississippi River. Plans for constructing a bridge to connect the two segments have been finalized, though the project is far from complete. The Ohio River Bridges Project is a controversial Louisville metropolitan area Transportation project involving the reconstruction of the Kennedy Interchange [3]
Freeway gaps
Freeway gaps occur where the Interstate is signed as a continuous route, but part or all of it is not up to freeway standards. This includes drawbridges where traffic on the Interstate can be stopped for vessels. A drawbridge is a type of Movable bridge typically associated with the entrance of a Castle. This does not include facilities such as tollbooths or toll plazas, agricultural inspection stations (as found in California), or border stations. A toll road, (also known as a tollway, turnpike, pike, or toll highway, especially if it is constructed to Freeway standards California ( is a US state on the West Coast of the United States, along the Pacific Ocean.
At-grade intersections and traffic lights
- Several Interstates in the southwest U. S. have at-grade intersections (including median breaks) with minor farm access roads. An at-grade intersection is a junction at which two or more transport axes cross at the same Level (or grade) This is usually due to the lack of an old highway, and the need to provide access to property that was accessed via the road prior to upgrade to Interstate, and the high cost to construct an interchange for the small amount of traffic that use such a connection or build a frontage road parallel to the freeway to the nearest interchange. A frontage road (also access road, feeder, service drive, service road, outer road, and especially surface road) is For instance, I-40 in both the western Texas Panhandle and in Haywood County in western North Carolina has several driveways and small roads intersecting directly with the highway. Interstate 40 (I-40 is a major west-east Interstate highway in the United States The Texas Panhandle is a region of the US state of Texas consisting of the northernmost 26 counties in the state Haywood County is a County located in the US state of North Carolina. North Carolina ( is a state located on the Atlantic Seaboard in the southeastern United States Such intersections can also be spotted on rural segments of I-5, particularly in southwestern Washington and central California.
- I-70 uses part of US 30 along a surface road in Breezewood, Pennsylvania, to get between the freeway heading south to Hancock, Maryland, and the ramp to the Pennsylvania Turnpike. Interstate 70 (I-70 is an Interstate highway in the United States that runs from Interstate 15 near Cove Fort Utah, to a Park and Ride US Route 30 is an east-west main route of the system of United States Numbered Highways, with the highway traveling across the northern tier of the country Breezewood is an unincorporated town in Bedford County in south-central Pennsylvania. Hancock is a town in Washington County, Maryland, United States. The Pennsylvania Turnpike is a toll highway system operated by the Pennsylvania Turnpike Commission in the state of Pennsylvania, United States. This is probably the best-known instance of traffic lights on an interstate. The traffic light, also known as traffic signal, stop light, traffic lamp, stop-and-go lights, robot or semaphore, There used to be a sign of a policeman pointing at drivers leaving the Pennsylvania Turnpike to enter US 30, saying, "You! Slow Down!" Local businesses have lobbied to keep the gap to avoid loss of business (Map, Aerial photo). The Pennsylvania Turnpike is a toll highway system operated by the Pennsylvania Turnpike Commission in the state of Pennsylvania, United States. [4]
- I-78 travels along a one-way pair of surface streets, 12th Street and 14th Street, in Jersey City, New Jersey, between the end of the New Jersey Turnpike Newark Bay Extension and the Holland Tunnel which leads into New York City. Route description Pennsylvania See also Interstate 78 in Pennsylvania I-78 begins at a directional-T interchange with Interstate A one-way pair or one-way couple is a pair of parallel usually One-way streets that carry opposite directions of a signed route or major Traffic flow or Jersey City is a city in Hudson County, New Jersey, United States. The New Jersey Turnpike (or simply The Turnpike as it is known to New Jersey residents is a Toll road in New Jersey and is one of the most heavily traveled The Holland Tunnel is a highway Tunnel under the Hudson River connecting the island of Manhattan in New York City with Jersey The City of New York Along with the aforementioned I-70, this is the only other primary interstate with traffic lights (which exist on both ends of the tunnel). [5]
- I-180 in Cheyenne, Wyoming has no parts built to freeway standards; in fact the interchange with I-80 is just a simple diamond interchange with two traffic lights on I-180, however it is expressway-quality with a few grade-separations (Map, Aerial photo). Interstate 180 (abbreviated I-180) is a spur off Interstate 80 into downtown Cheyenne, Wyoming ( Map aerial photo Cheyenne ( /ʃaɪˈæn/ or /ʃaɪˈɛn/) is the capital of the U Interstate 80 (I-80 is the second-longest Interstate Highway in the United States (after I-90) A diamond interchange is a common type of Road junction. Diamond interchanges are used where a Freeway crosses a minor road An expressway is a Divided highway for high-speed traffic with at least partial Control of access.
- I-585 in Spartanburg, South Carolina, is cosigned with US 176, in which I-585 shields are present in beyond the point where it ceases to be a freeway, having passed through traffic lights. Interstate 585 (I-585 stretches from an Interstate 85 Business loop to Spartanburg South Carolina. Spartanburg is the largest city in and the County seat of Spartanburg County, South Carolina, United US Route 176 is a spur of US Route 76. It currently runs for 229 miles (369 km from Goose Creek South Carolina at U There also exists a sign that marks the road there as "I-585 Business Spur" and hence it is unclear whether that surface section of US 176 also belongs to I-585.
- I-676 has a surface street section at the west end of the Ben Franklin Bridge in Philadelphia, Pennsylvania, because of historically significant areas. Interstate 676 (abbreviated I-676) is an Interstate highway that serves as a major thoroughfare through Philadelphia, Pennsylvania, where it The Benjamin Franklin Bridge (also known as the Ben Franklin Bridge) originally named the Delaware River Bridge, is a Suspension bridge across the Philadelphia (ˌfɪləˈdɛlfiə Signage and the Federal Highway Administration consider I-676 to use the surface streets; the Pennsylvania Department of Transportation and the New Jersey Department of Transportation consider I-676 to be continuous across the Ben Franklin Bridge, even though the bridge, built in 1926, is not up to Interstate standards (Aerial photo). The Federal Highway Administration ( FHWA) is a division of the United States Department of Transportation that specializes in Highway transportation The Pennsylvania Department of Transportation ( PennDOT) oversees Transportation issues in the Commonwealth of Pennsylvania. The New Jersey Department of Transportation ( NJ DOT) is the agency responsible for transportation issues and policy in New Jersey. The Benjamin Franklin Bridge (also known as the Ben Franklin Bridge) originally named the Delaware River Bridge, is a Suspension bridge across the
- I-690 in Syracuse, New York, has a traffic light for twelve days each year, for buses to carry Great New York State Fair attendees from parking areas across the road to the fair. Interstate 690 (abbreviated I-690) is a 1419 Mile -long urban Interstate Highway built in the early 1970s in the Syracuse New York Syracuse (locally ˈsɛrəkjuːs sometimes ˈsɪrəkjuːs or /ˈsɪərəkjuːs/ by non-natives is a city in Central New York, USA. The Great New York State Fair is an annual farmers' exposition and a 12-day showcase of entertainment education industry and technology sponsored by the State of New York
Undivided freeways
This section addresses two-lane freeways and other undivided freeway sections of the Interstate, excepting instances of continuing routes using one-lane ramps. A two-lane freeway or two-lane expressway is a Freeway or Expressway with only one lane in each direction and usually no Median barrier
- I-93 is a two-lane, divided parkway, or "Super Two", through Franconia Notch in New Hampshire. Interstate 93 (abbreviated I-93) is an Interstate highway in the New England section of the United States. Franconia Notch (el 1950 ft / 590 m is a major Mountain pass through the White Mountains of New Hampshire. A four-lane interstate was proposed, but was abandoned due to environmental concerns, in part related to vibrations which could harm the Old Man of the Mountain (which collapsed in 2003). History The formation was carved by Glaciers and was first recorded as being discovered by a surveying team circa 1805 The section was, for many years, signed as US 3 and "To 93" but has since been replaced with I-93 shields. The Federal Highway Act of 1973 exempts this stretch from Interstate standards, and it is considered I-93 by FHWA. [6]
Drawbridges
- I-5 crosses the Columbia River from Portland, Oregon to Vancouver, Washington on the Interstate Bridge, a drawbridge. Interstate 5 (I-5 is the main Interstate highway on the West Coast of the United States, paralleling the Pacific Ocean from Canada to Mexico The Columbia River (known as Portland is a city located in the Northwestern United States, near the Confluence of the Willamette and Columbia rivers Vancouver is a city on the north bank of the Columbia River in the U The Interstate Bridge (also Columbia River Interstate Bridge, I-5 Bridge, Portland-Vancouver Interstate Bridge) is a pair of nearly identical steel There are plans to replace it with a higher one and extend the MAX Light Rail system to Vancouver. Metropolitan Area Express (MAX is a Light rail system in the Portland metropolitan area in the U [7]
- I-64/Hampton Roads Beltway crosses the South Branch of the Elizabeth River in Chesapeake, Virginia on the High Rise Bridge, a drawbridge. Interstate 64 (abbreviated I-64) is an Interstate Highway in the eastern United States. The Hampton Roads Beltway is a loop of Interstate 64 and Interstate 664, which links the communities of the Virginia Peninsula and South Hampton Roads The Elizabeth River is a short Tidal estuary forming an arm of Hampton Roads at the southern end of Chesapeake Bay in southeast Virginia in the Chesapeake is an Independent city located in the South Hampton Roads portion of the Hampton Roads region of eastern Virginia in the High Rise Bridge is a bascule Drawbridge which carries a portion of the Hampton Roads Beltway designated as Interstate 64 across the Southern Branch of This is the part of I-64 which does not have "east" and "west" posted on it, because of I-64 curving to the opposite compass direction.
- I-95/I-495/Capital Beltway passes over the Potomac River on the new Woodrow Wilson Bridge, a drawbridge, south of Washington, D.C. While this bridge requires fewer openings than the old Woodrow Wilson Bridge (which was demolished in the summer of 2006), there will still be an estimated 65 openings per year. Interstate 95 ( I-95) is the main Highway on the East Coast of the United States, paralleling the Atlantic Ocean from Maine to Interstate 495 (abbreviated I-495) is a Freeway -class Interstate highway which circles Washington D Interstate 495 (abbreviated I-495) is a Freeway -class Interstate highway which circles Washington D The Potomac River flows into the Chesapeake Bay, located along the mid- Atlantic coast of the United States. Washington DC ( formally the District of Columbia and commonly referred to as Washington, the District, or simply D
- I-110 has a drawbridge across the Back Bay of Biloxi in Biloxi, Mississippi. Interstate 110 (abbreviated I-110) is a 41 mile freeway spur route in Biloxi, running south from Interstate 10 to U
- I-264 has a drawbridge (Berkley Bridge) over the Elizabeth River in Norfolk, Virginia. Interstate 264 (abbreviated I-264) is an Interstate Highway in the U The Berkley Bridge is a double-leaf Bascule bridge across the Eastern Branch of the Elizabeth River in Norfolk Virginia, United States. The Elizabeth River is a short Tidal estuary forming an arm of Hampton Roads at the southern end of Chesapeake Bay in southeast Virginia in the Norfolk is an Independent city in the Commonwealth of Virginia in the United States
- I-278 has a drawbridge across the Bronx River in Bronx, New York. Interstate 278 (abbreviated I-278) is an Interstate Highway in the U The Bronx River, approximately 24 miles (38 km long flows through southeast New York in the United States.
- I-280 (New Jersey) has a drawbridge (Stickel Memorial Bridge) over the Passaic River connecting Newark, New Jersey to Harrison, New Jersey. Interstate 280 (abbreviated I-280) is a 1785-mile (2873 km Interstate Highway, providing a spur from Interstate 80 to Newark New Jersey and The William A Stickel Memorial Bridge is a Vertical lift bridge in New Jersey that crosses the Passaic River, connecting Newark and Harrison The Passaic River is a Tributary of Newark Bay, approximately 80 mi (129 km long in northern New Jersey in the United States. Newark is the largest city in New Jersey, United States and the County seat of Essex County. Harrison is a town in Hudson County, New Jersey, United States.
- I-695/Baltimore Beltway has a drawbridge over Curtis Creek south of Baltimore, Maryland, a bit to the west of the Francis Scott Key Bridge. Interstate 695 (abbreviated I-695) is a -long full beltway Interstate highway extending around Baltimore Maryland, USA. Interstate 695 (abbreviated I-695) is a -long full beltway Interstate highway extending around Baltimore Maryland, USA. Curtis Creek is a creek located in the city of Baltimore, Maryland. Not to be confused with the Francis Scott Key Bridge (Washington The Francis Scott Key Bridge, also known as the Outer Harbor Bridge or
Connection gaps
Auxiliary Interstates (also known as 3-digit Interstates) are intended to connect to their parent either directly or via a same-parented Interstate (like I-280 in California being connected to I-80 via I-680). The auxiliary Interstate Highways (also called 3-digit Interstate Highways) is an additional network of freeways of the Interstate Highway System. The auxiliary Interstate Highways (also called 3-digit Interstate Highways) is an additional network of freeways of the Interstate Highway System. Interstate 280 (I-280 is a 57 mile (92 km long interstate Freeway in the San Francisco Bay Area metropolitan area of Northern California Interstate 80 (I-80 is the second-longest Interstate Highway in the United States (after I-90) Interstate 680 (I-680 is a north-south Interstate Highway in the San Francisco Bay Area of the U
- I-210 in California at present does not directly connect to I-10, though it used to (via what is now State Route 57) and will again (through what is now State Route 30) by 2008, when the last segment of State Route 210 is finished and renamed to I-210. Route 210, marked partially as Interstate 210 (I-210 and as State Route 210 (SR 210 and named the Foothill Freeway, is a State highway in Interstate 10 ( I-10) is the southernmost east-west coast-to-coast Interstate highway in the United States. State Route 57 (SR 57 also known as the Orange Freeway, is a major north-south State highway in the Greater Los Angeles Area of the U Route 210, marked partially as Interstate 210 (I-210 and as State Route 210 (SR 210 and named the Foothill Freeway, is a State highway in 2008 ( MMVIII) is the current year in accordance with the Gregorian calendar, a Leap year that started on Tuesday of the Common Route 210, marked partially as Interstate 210 (I-210 and as State Route 210 (SR 210 and named the Foothill Freeway, is a State highway in
- I-238 in Alameda County, California, is unique in that there is no parent I-38. Interstate 238 (I-238 is a short auxiliary route of the Interstate Highway System in the San Francisco Bay Area, California, United States. Alameda County is a county in the US state of California. It occupies most of the East Bay region of the San Francisco Bay Area. I-238 does intersect two spurs of I-80, I-580 and I-880. Interstate 80 (I-80 is the second-longest Interstate Highway in the United States (after I-90) Interstate 880 (I-880 is an Interstate highway in the San Francisco Bay Area connecting San Jose and Oakland, running parallel to the southeastern I-238 was named after the connecting State Route 238, because there were eight I-80 spurs in California already at the time, and a State Route 180 (California does not like to use the same number twice, even for different designation shields). State Route 238 is a north-south highway in the southeastern part of the San Francisco Bay Area, USA State Route 180 is a State highway in California, United States, which runs through the heart of the San Joaquin Valley from Mendota Since then, I-480 has been demolished and its number is now unused. State Route 480 was a proposed State highway in San Francisco California, United States, consisting of the elevated double-decker Embarcadero Freeway
- None of the spurs of I-78 (I-278, I-478, I-678, I-878) connects to its parent. Route description Pennsylvania See also Interstate 78 in Pennsylvania I-78 begins at a directional-T interchange with Interstate Interstate 278 (abbreviated I-278) is an Interstate Highway in the U The Brooklyn-Battery Tunnel is a Toll road in New York City which crosses under the East River at its mouth connecting the Boroughs of Interstate 678 (abbreviated I-678) is a north-south Spur route in the Interstate Highway System that runs 14 miles (23 km entirely within two boroughs "Interstate 878" redirects here For the I-878 designated from 1959 to 1970 see Interstate 878 (1959. I-78 was planned to extend through New York City and end as two branches, where I-295 and I-695 now end at I-95. The City of New York Interstate 295 (abbreviated I-295) is a connector route within New York City. Interstate 695 (abbreviated I-695) is a short connector route in The Bronx between I-95 ( Bruckner Expressway) and I-295 ( Cross Interstate 95, the major Interstate Highway along the East Coast of the United States, runs 23 I-478 comes the closest, and would have intersected if the Westway project wasn't canceled; I-278, the only I-78 spur to leave New York City, was planned to extend northwest to I-78 at Route 24. For other uses of the term Westway see Westway Westway was the name of a proposed project to put New York City 's West Side Highway underground The City of New York Route 24 is a State highway in New Jersey, United States, that extends 10 Since all the spurs are interconnected, only one of them needs to be eventually connected to its parent route for all of them to conform to standards.
- I-585 used to connect with I-85 in Spartanburg, South Carolina, but I-85 was moved to a new bypassing route, and now I-585 ends at the I-85 Business loop. Interstate 585 (I-585 stretches from an Interstate 85 Business loop to Spartanburg South Carolina. Interstate 85 (I-85 is an Interstate highway in the southeastern United States. Spartanburg is the largest city in and the County seat of Spartanburg County, South Carolina, United Interstate 85 Business is a Business Loop of the Interstate Highway System and a Freeway, running along the old route of Interstate 85 through The signed connection to I-85 is via a surface section of US 176. US Route 176 is a spur of US Route 76. It currently runs for 229 miles (369 km from Goose Creek South Carolina at U
Other gaps
- In four cases — I-76, I-84, I-86 and I-88 — the same primary interstate route numbers is used on two separate, unconnected lengths of roadway, one in the eastern portion of the country and one in the western portion. These gaps are intentional – the two segments of roadway are not planned to be linked together.
- Gaps in Interstate Highway standards, such as shoulder widths and bridge clearances, since these are too frequent
- Gaps on the Interstates in Alaska and Puerto Rico, since those are not held to the same standards
- Places where Interstates cross but don't connect via a freeway-standard connection (e. I-blank widesvg|90px|right]] Standards for Interstate Highways in the United States are defined by the American Association of State Highway and Transportation Officials There are four officially designated interstate highways in Alaska, even though Alaska is usually considered to have no interstates and the routes do not connect There are three officially designated Interstate Highways in Puerto Rico. g. I-84 and I-87 in New York). Interstate 84 (abbreviated I-84) is an Interstate highway extending from Dunmore Pennsylvania (near Scranton Pennsylvania) at an intersection Interstate 87 (abbreviated I-87) is a 33349 mile (53670 km intrastate Interstate highway located entirely within the state of New York There is construction going on to change this by the mid-2010s. The 2010s Decade is a period of 10 years that will begin on January 1, 2010 and will end on December 31, 2019.
- "Non-Interchanges" where two Interstates cross but don't connect at all (e. g. I-78 and I-476 in Allentown, PA). Route description Pennsylvania See also Interstate 78 in Pennsylvania I-78 begins at a directional-T interchange with Interstate Route description Blue Route portion of Interstate 476 between Interstate 95 and Interstate 276, going north-south through Delaware For the song by Billy Joel, see " Allentown (song." For the neighborhood in Pittsburgh
- Places where a three-digit Interstate connects to its parent via another three-digit Interstate of the same parent; the numbering system allows for this (e. g. I-270 and I-370). Interstate 270 (abbreviated I-270) is a 344-mile spur Interstate highway that travels between Interstate 70 in Frederick Maryland Interstate 370 (abbreviated I-370) is a 313-mile Interstate highway spur route off Interstate 270 in Gaithersburg, Maryland
- Sometimes, near toll booths (e. g. Mackinac Bridge toll booth), a brief segment of the Interstate will have a median break with a double-yellow line but have at least 4 lanes total. The Mackinac Bridge (ˈmækɨnɔː with a silent "c" at the end of the word is a Suspension bridge spanning the Straits of Mackinac to connect the On divided roads including Expressways Motorways or Autobahns the central reservation (British English, median (North American A double-yellow line is a common Road marking meaning different things in many parts of the world
- Metering lights to regulate the flow of traffic onto bridges and skyways, such as those on westbound I-80 approaching the San Francisco-Oakland Bay Bridge. A ramp meter, ramp signal or metering light is a device usually a basic Traffic light or a two-phase (red and green no yellow light together Interstate 80 (I-80 is the second-longest Interstate Highway in the United States (after I-90)
- Median breaks for maintenance and/or emergency vehicles to access government driveways. These exist on many highways that are otherwise considered freeways, including Interstates.
- Places where non-spur interstates appear to end at a traffic light soon after intersecting with another freeway, such as I-17's terminus at I-40 in Flagstaff, Arizona, I-630's terminus at I-430 in Little Rock, Arkansas however proposals have been made to re engineer the intersection do to increased volumes of traffic or I-89's terminus at I-93 in Bow, New Hampshire. Interstate 17 (I-17, also known as Black Canyon Freeway is an intrastate Interstate highway located entirely within the state of Arizona, United Interstate 40 (I-40 is a major west-east Interstate highway in the United States Flagstaff (Kinłání is a city located in northern Arizona, in the southwestern United States Interstate 630 (abbreviated I-630) in Arkansas is an east-west connector within Little Rock. Interstate 430 (abbreviated I-430) in Arkansas is a nearly 13- Mile (20km long spur route connecting Interstate 40 near Maumelle Arkansas Little Rock is the Capital and the most populous city of the U Interstate 89 (abbreviated I-89) is an Interstate highway in the New England region of the United States. Interstate 93 (abbreviated I-93) is an Interstate highway in the New England section of the United States. Bow is a town in Merrimack County, New Hampshire, United States.
- Places where an Interstate technically ends partway across a nonconforming bridge on an international crossing, such as where I-75 and I-81 cross into Canada. Interstate 75 (I-75 is a major north-south Interstate Highway in the midwest and southeastern United States. Interstate 81 (abbreviated I-81) is an Interstate highway in the eastern part of the United States.
- Business loops and spurs are not subject to mainline freeway standards. List of Business Routes Interstate 5 |-| Business Loop | San Ysidro
Notes
- ^ http://www.fhwa.dot.gov/programadmin/toll_Rds.html
- ^ http://tollroadsnews.info/artman/publish/article_969.shtml
- ^ Kentucky Indiana Bridges - Home
- ^ Manuel Roig-Franzia, "The Town That Stops Traffic: Travelers Encounter Way Station as Way of Life in Breezewood," Washington Post, 22 November 2001, B1. The Washington Post is the largest and most circulated Newspaper in Washington D
- ^ http://maps.google.com/maps?q=Jersey+City+NJ&ll=40.731088,-74.041382&spn=0.003317,0.008615&t=h Map and Aerial photo
- ^ Interstate System Conditions and Performance - Highway History - Infrastructure - FHWA
- ^ Columbia River Crossing: Home
References
| Main Interstate Highways (multiples of 5 in pink) |  | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 4 | 5 | 8 | 10 | 12 | 15 | 16 | 17 | 19 | 20 | 22 | 24 | 25 | 26 | 27 | 29 | 30 | |||
| 35 | 37 | 39 | 40 | 43 | 44 | 45 | 49 | 55 | 57 | 59 | 64 | 65 | 66 | 68 | 69 | ||||
| 70 | 71 | 72 | 73 | 74 | 75 | 76 (W) | 76 (E) | 77 | 78 | 79 | 80 | 81 | 82 | ||||||
| 83 | 84 (W) | 84 (E) | 85 | 86 (W) | 86 (E) | 87 | 88 (W) | 88 (E) | 89 | 90 | |||||||||
| 91 | 93 | 94 | 95 | 96 | 97 | 99 | (238) | H-1 | H-2 | H-3 | |||||||||
| Unsigned | A-1 | A-2 | A-3 | A-4 | PRI-1 | PRI-2 | PRI-3 | ||||||||||||
| Lists | Primary | Main - Intrastate - Suffixed - Future - Gaps | |||||||||||||||||
| Auxiliary | Main - Future - Unsigned | ||||||||||||||||||
| Other | Standards - Business - Bypassed | ||||||||||||||||||
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