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The highway system of the United States is a network of interconnected state, U.S., and Interstate highways. Each of thefifty states, theDistrict of Columbia,Puerto Rico,American Samoa,Guam, theNorthern Mariana Islands, and theU.S. Virgin Islands own and maintain a part of this vast system, including U.S. and Interstate highways, which are not owned or maintained at the federal level.

Interstate Highways have the highest speed limits and the highest traffic numbers. Interstates are numbered in a grid: even-numbered routes for east–west routes (with the lowest numbers alongMexico and theGulf of Mexico), and odd-numbered routes are north–south routes (with the lowest numbers along thePacific Ocean). Three-digit Interstates are, generally, either beltways or spurs of their parent Interstates (for example,Interstate 510 is a spur into the city ofNew Orleans, Louisiana, and is connected toInterstate 10).

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U.S. Numbered Highways are the original interstate highways, dating back to 1926. U.S. Highways are also numbered in a grid: even numbered for east–west routes (with the lowest numbers alongCanada) and odd numbered for north–south routes (with the lowest numbers along theAtlantic Ocean). Three-digit highways, also known as "child routes," are branches off their main one- or two-digit "parents" (for example,U.S. Route 202 is a branch ofU.S. Route 2). However,US 101, rather than a "child" ofUS 1, is considered a "mainline" U.S. Route.

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Marker for Secondary State Route 14 in Tennessee

State highways are the next level in the hierarchy. Each state and territory has its own system for numbering highways, some more systematic than others. Each state also has its own design for its highway markers; the number in a circle is the default sign, but many choose a different design connected to the state, such as an outline of the state with the number inside. Many states also operate a system ofcounty highways.

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Scenic byways can be designated over any classification of road in the United States. There are theNational Scenic Byways,National Forest Scenic Byways andBureau of Land Management Back Country Byways at the national level. Most states have their own system for designating byways, some more systematic than others. Native American tribes may designate byways as well.

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Interstate 696 (I-696) is an east–westauxiliary Interstate Highway in theMetro Detroit region of the US state ofMichigan. Thestate trunkline highway is also known as theWalter P. Reuther Freeway, named for the prominentauto industry union head by theMichigan Legislature in 1971. I-696 is a bypass route, detouring around the city ofDetroit through the city's northern suburbs inOakland andMacomb counties. It starts by branching offI-96 andI-275 at its western terminus inFarmington Hills, and runs through suburbs includingSouthfield,Royal Oak andWarren before merging intoI-94 atSt. Clair Shores on the east end. It has eight lanes for most of its length and is approximately 10 miles (16 km) north of downtown Detroit. I-696 connects to other freeways such asI-75 (Chrysler Freeway) andM-10 (Lodge Freeway). Local residents sometimes refer to I-696 as "The Autobahn of Detroit".

Planning for the freeway started in the 1950s. Michigan state officials proposed the designation I-98, but this was not approved. Construction started on the first segment in 1961, and the Lodge Freeway was designatedBusiness Spur Interstate 696 (BS I-696) the following year. The western third of the freeway opened in 1963, and the eastern third was completed in January 1979. The central segment was the subject of much controversy during the 1960s and 1970s. Various municipalities along this stretch argued over the routing of the freeway such that the governor locked several officials into a room overnight until they would agree to a routing. Later, various groups used federal environmental regulations to force changes to the freeway. TheOrthodox Jewish community inOak Park was concerned about pedestrian access across the freeway; I-696 was built with a set of parks on overpasses to accommodate their needs. TheDetroit Zoo and the City of Detroit also fought components of the freeway design. These concessions delayed the completion of I-696 until December 15, 1989. Since completion, the speed limit was raised from 55 to 70 miles per hour (89 to 113 km/h). In addition, some interchanges were reconfigured in 2006. (Full article...)
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U.S. Route 101, orU.S. Highway 101 (US 101), is a major north–south highway that traverses the states of California, Oregon, and Washington on theWest Coast of the United States. It is part of theUnited States Numbered Highway System and runs for over 1,500 miles (2,400 km) along thePacific Ocean. The highway is also known by various names, includingEl Camino Real in parts of California, theOregon Coast Highway, and theOlympic Highway in Washington. Despite its three-digit number, normally used forspur routes, US 101 is classified as a primary route with 10 as its "first digit".

The highway's southern terminus is at amajor interchange withInterstate 5 (I-5) andI-10 inLos Angeles. US 101 follows several freeways inSouthern California as it travels north of theSanta Monica Mountains and along the coast, where it isconcurrent withCalifornia State Route 1 (SR 1). The highway travels inland from the coast after it splits from SR 1 and approaches theSan Francisco Bay Area, where it becomes theBayshore Freeway and later traversesSan Francisco on city streets to reach theGolden Gate Bridge. US 101 continues north on theRedwood Highway and rejoins the coast before it enters Oregon. (Full article...)
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New York State Route 308 (NY 308) is a shortstate highway, 6.19 miles (9.96 km) in length, located entirely in northernDutchess County, in theU.S. state ofNew York. It is a majorcollector road through a mostly rural area, serving primarily as a shortcut for traffic from the two main north–south routes in the area,U.S. Route 9 (US 9) andNY 9G, to get toNY 199 and theTaconic State Parkway. The western end of NY 308 is located withinRhinebeck'shistoric district, a 2.6-square-mile (6.7 km²)historic district comprising 272 historical structures. The highway passes near the Dutchess County Fairgrounds, several historical landmarks, and briefly parallels the LandsmanKill.

Artifacts found near Lake Sepasco, near NY 308's eastern terminus atRock City, date to about 1685, when the SepascoNative Americans built the Sepasco Trail from the Hudson River, eastward through modern-day Rhinebeck (then Sepasco or Sepascoot) to the lake, following roughly NY 308 and its side roads. The trail remained until 1802, when part of theUlster and Delaware Turnpike—also known as the Salisbury Turnpike—was chartered over the trail and extended fromSalisbury, Connecticut, to theSusquehanna River at or near the Town of Jericho (nowBainbridge). (Full article...)
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US Highway 25 (US 25) was a part of theUnited States Numbered Highway System in the state ofMichigan that ran from theOhio state line nearToledo and ended at the tip ofThe Thumb inPort Austin. The general routing of thisstate trunkline highway took it northeasterly from the state line throughMonroe andDetroit toPort Huron. Along this southern half, it followedundivided highways andran concurrently along two freeways,Interstate 75 (I-75) andI-94. Near the foot of theBlue Water Bridge in Port Huron, US 25 turned north and northwesterly along theLake Huron shoreline to Port Austin.

Created with the initial US Highway System on November 11, 1926, US 25 replaced several previous state highway designations. Some of the preceding highways followed roadways created in the 19th and the early 20th centuries. It initially was only routed as far north as Port Huron; the northern extension to Port Austin happened in 1933. By the end of the 1950s, the entire route was paved. Starting in the early 1960s, segments of I-75 and I-94 were built, and US 25 was shifted to follow them south of Detroit to Port Huron. A business loop was created when the main highway bypassed downtown Port Huron, and then in 1973, the entire designation was removed from the state. The final routing of the highway is still maintained by the state under eight different designations, someunsigned. (Full article...)
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View of the route, 1920

TheRidge Route, officially theCastaic–Tejon Route and colloquially known asthe Grapevine, was a two-lane highway betweenLos Angeles County andKern County, California. Opened in 1915 and paved withconcrete between 1917 and 1921, the road was the firstpaved highway directly linking theLos Angeles Basin with theSan Joaquin Valley (southernCentral Valley) over theTejon Pass and the ruggedSierra Pelona Mountains ridge south ofGorman. Much of the old road runs through theAngeles National Forest, and passes many historical landmarks, including the National Forest Inn, Reservoir Summit, Kelly's Half Way Inn, Tumble Inn, and Sandberg's Summit Hotel. North of the forest, the Ridge Route passed through Deadman's Curve before ending atGrapevine.

The road was originally built as a state highway, a segment of the unsignedLegislative Route 4, before it became signed as part ofU.S. Route 99 (US 99) in 1926. The road was then bypassed by the three-laneRidge Route Alternate to handle increased traffic and remove curves; the Alternate in Los Angeles County was completed in 1933, and Kern County line to Grapevine in 1936. The roadway was widened to a four-laneexpressway in 1953 and replaced by an eight-lanefreeway,Interstate 5 (I-5) in 1960-70. The portion of the road in the Angeles National Forest was added to theNational Register of Historic Places in 1997, by the efforts of retired engineer Harrison Scott. Much of the road has been closed by theU.S. Forest Service; other remnants are used by local traffic. (Full article...)
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New York State Route 174 (NY 174) is astate highway inOnondaga County, located inCentral New York, in the United States. The highway is 16.7 miles (26.9 km) long and passes through mostly rural regions. Route 174 begins at an intersection withNY 41 inBorodino, a hamlet ofSpafford. It heads generally northward for most of its length, except for short distances in the villages ofMarcellus andCamillus. The route ends at a junction withNY 5 west of Camillus, at the west end of the Route 5 Camillus bypass. Route 174 is located along a largemapped sedimentary bedrock unit, known as theMarcellus Formation. The formation is named for anoutcrop found near the town ofMarcellus, New York, during ageological survey in 1839.

The road was first constructed in the early 19th century following the path ofNine Mile Creek, which connected several early settlements in Central New York. The northern half of the route, between the villages of Marcellus and Camillus, was later improved as aplank road in 1855 by a private corporation that collected tolls from travelers on the road. The state took over the maintenance of the road by the beginning of the 20th century. The former plank road and an extension south toOtisco Lake and southwest toSkaneateles Lake was first designated as Route 174 in the1930 state highway renumbering. Since then, several minor realignments have been made in the areas of the villages of Marcellus and Camillus to accommodate newly built bypasses. (Full article...)
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New York State Route 74 (NY 74) andVermont Route 74 (VT 74) are state highways in the northeastern United States, connected by one of the last remainingcable ferries in North America. Together they extend for 34 miles (55 km) throughEssex County, New York, andAddison County, Vermont. NY 74 begins at exit 28 offInterstate 87 (I-87) inthe hamlet of Severance in theAdirondack Mountains region of the northern part ofNew York State. It extends 20.44 miles (32.89 km) to the western shore ofLake Champlain inTiconderoga. There, the seasonal Fort Ticonderoga–Larrabees Point Ferry carries cars across the state border intoVermont, where VT 74 starts at the lake's eastern shore and terminates 13.26 miles (21.34 km) later at a junction withVT 30 in the town ofCornwall.

The ferry connecting the two highways, predating both NY 74 and VT 74, began operation in 1759 on an informal basis. The ferry operation was formalized at the close of the 18th century and upgraded to a cable system in 1946. (Full article...)
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TheChickasaw Turnpike, also designatedState Highway 301 (SH-301), is acontrolled-access toll road in the ruralsouth central region of the U.S. state ofOklahoma. Atwo-lane freeway, it stretches for 13.3 miles (21.4 km) from north ofSulphur to just south ofAda. TheOklahoma Turnpike Authority (OTA) owns, maintains, and collects tolls on the turnpike. The first section of the Chickasaw Turnpike opened on September 1, 1991.

The Chickasaw resulted from a compromise between urban and rural legislators. Originally, it was part of a now-canceled plan to connect southern and eastern Oklahoma with a longer turnpike. It was also intended to link Ada to the Interstate system. A four-mile (6.4 km) segment of the turnpike was transferred to theOklahoma Department of Transportation (ODOT), making it a toll-free road, in 2011. (Full article...)
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Interstate 296 (I-296) is a part of theInterstate Highway System in the US state ofMichigan. It is a north–southstate trunkline highway that runs for 3.43 miles (5.52 km) entirely within theGrand Rapids area. Its termini areI-196 near downtown Grand Rapids andI-96 on the north side of Grand Rapids inWalker. For most of its length, the Interstateruns concurrently withU.S. Highway 131 (US 131), which continues as a freeway built toInterstate Highway standards north and south of the shorter I-296. The highway was first proposed in the late 1950s and opened in December 1962, but theMichigan Department of Transportation (MDOT) has since eliminated all signage for I-296 and removed the designation from their official state map. The designation is thereforeunsigned, but still listed on the Interstate Highway System route log maintained by theFederal Highway Administration (FHWA). (Full article...)
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Business M-28 (Bus. M-28) is astate trunkline highway serving as abusiness route that runs for approximately 4.9 miles (7.9 km) through the downtown districts ofIshpeming andNegaunee in the US state ofMichigan. The trunkline provides a marked route for traffic diverting fromU.S. Highway 41 (US 41) andM-28 through the two historic iron-mining communities. It is one of three business loops for M-numbered highways in the state of Michigan. There have previously been two other Bus. M-28 designations for highways inNewberry andMarquette.

The trunkline was originally a section of US 41/M-28 andM-35. Before the 1930s, the main highways ran through the two downtown areas when US 41/M-28 was relocated to run nearTeal Lake. The former routing had various names over the years. It was designated as analternate route of the main highways, using both theUS 41A/M-28A andAlt. US 41/Alt. M-28 designations before it was designated as Bus. M-28 in 1958. M-35 continued to run through downtown Negaunee along a section of the highway until the 1960s. A rerouting in 1999 moved the trunkline designation along Lakeshore Drive in Ishpeming, and a streetscape project rebuilt the road in Negaunee in 2005. (Full article...)
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M-6, or thePaul B. Henry Freeway, is a 19.7-mile-long (31.7 km) east–westfreeway andstate trunkline highway in the United States that serves portions of southernKent and easternOttawa counties south ofGrand Rapids, Michigan. Although the freeway is named forPaul B. Henry, local residents and the press continue to use the original name,South Beltline as well on occasion. The freeway connectsInterstate 196 (I-196) on the west withI-96 on the east. M-6 also provides a connection toU.S. Highway 131 (US 131) in the middle of its corridor while running through severaltownships on the south side of theGrand Rapids metropolitan area inWestern Michigan. Each end is in a rural area while the central section has suburban development along the trunkline.

The freeway was originally conceived in the 1960s. It took 32 years to approve, plan, finance, and build the freeway from the time that the state first authorized funding in 1972 to the time of the ribbon-cutting ceremony in 2004 that opened the South Beltline to traffic. The project cost around $700 million or around $35 million per mile (approximately $22 million per kilometer). Initial construction started in November 1997, with the first phase opened in November 2001. The full freeway was opened in November 2004. The first phase of construction was completed inasphalt, while the second and third phases were built in concrete. The project was built with two firsts: the firstsingle-point urban interchange (SPUI;/ˈspuːiː/) in Michigan, and a new technique to apply the pavement markings, embedding them into the concrete to reduce the chance of a snowplow scraping them off. In advance of the opening of the freeway to traffic, theMichigan Department of Transportation (MDOT) allowed the public to walk or bike the South Beltline in an open-house event called the "Southbelt Shuffle". (Full article...)
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Interstate 96 (I-96) is an east–westInterstate Highway that runs for approximately 192 miles (309 km) entirely within theLower Peninsula of the US state ofMichigan. The western terminus is at an interchange withUS Highway 31 (US 31) andBusiness US 31 (Bus. US 31) on the eastern boundary ofNorton Shores southeast ofMuskegon, and the eastern terminus is atI-75 near theAmbassador Bridge inDetroit. FromGrand Rapids throughLansing to Detroit, the freeway parallels Grand River Avenue, never straying more than a few miles from the decommissionedUS 16. TheWayne County section of I-96 is named theJeffries Freeway from its eastern terminus to the junction withI-275 andM-14. Though maps still refer to the freeway as the Jeffries, the portion within the city of Detroit was renamed by the state legislature as theRosa Parks Memorial Highway in December 2005 in honor of the latecivil rights pioneer. There are fourauxiliary Interstates as well as two current and four formerbusiness routes associated with I-96.

Grand River Avenue originated as anIndian trail before Michigan statehood. It later was used as a wagon road across the state. The roadway was included in theState Trunkline Highway System in 1919 as M-16 and later theUnited States Numbered Highway System as US 16. Construction of a freeway along the length of the corridor was proposed in the 1940s, and included as part of the Interstate Highway System in the mid-1950s. This construction was started in 1956 and initially completed across the state to Detroit in 1962. The proposed route for the Jeffries Freeway in Detroit was moved in the 1960s; it was built in the 1970s. I-96 was completed on November 21, 1977, in the Detroit area, closing the last gap along the route. Since then, additional interchanges and lanes have been added in places to accommodate traffic needs. (Full article...)
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Interstate 40 (I-40) is part of theInterstate Highway System that runs 2,556.61 miles (4,114.46 km) fromBarstow, California, toWilmington, North Carolina. The highway crosses the state ofTennessee from west to east, from theMississippi River at theArkansas state line to theBlue Ridge Mountains at theNorth Carolina state line. At 455.28 miles (732.70 km), the Tennessee segment of I-40 is the longest of the eight states through which it passes and the state's longest Interstate Highway.

I-40 passes through Tennessee's three largest cities—Memphis,Nashville, andKnoxville—and serves theGreat Smoky Mountains National Park, the most-visited national park in the United States. It crosses all of Tennessee'sphysiographic regions andGrand Divisions—theMississippi embayment andGulf Coastal Plain inWest Tennessee, theHighland Rim andNashville Basin inMiddle Tennessee, and theCumberland Plateau,Cumberland Mountains,Ridge-and-Valley Appalachians, andBlue Ridge Mountains inEast Tennessee. Landscapes on the route vary from flat, level plains and swamplands in the west to irregular rolling hills, cavernous limestone bluffs, and deep river gorges in the central part of the state, to plateautablelands, broad river valleys, narrow mountain passes, and mountain peaks in the east. (Full article...)
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I-8 inSan Diego, from theSan Diego Trolley

Interstate 8 (I-8) is anInterstate Highway in thesouthwestern United States. It runs from the southern edge ofMission Bay at Sunset Cliffs Boulevard inSan Diego, California, almost at the Pacific Ocean, to the junction withI-10, just southeast ofCasa Grande, Arizona. In California, the freeway travels through the San Diego metropolitan area as theOcean Beach Freeway and theMission Valley Freeway before traversing theCuyamaca Mountains and providing access through theImperial Valley, including the city ofEl Centro. Crossing theColorado River intoArizona, I-8 continues through the city ofYuma across theSonoran Desert to Casa Grande, in between the cities ofPhoenix andTucson.

The first route over the Cuyamaca Mountains was dedicated in 1912, and aplank road served as the first road across the Imperial Valley to Yuma; east of there, theGila Trail continued east toGila Bend. These were later replaced byU.S. Route 80 (US 80) across California and part of Arizona, andArizona State Route 84 (SR 84) between Gila Bend and Casa Grande. The US 80 freeway through San Diego was largely complete by the time it was renumbered as I-8 in the1964 state highway renumbering; east of San Diego, the US 80 roadway was slowly replaced by I-8 as construction progressed in the Imperial Valley. The Arizona portion of the road was built starting in the 1960s. Several controversies erupted during the construction process; questionable labor practices in Imperial County led to the federal conviction of mobsterJimmy Fratianno, and aU.S. House of Representatives subcommittee found that the Arizona government had mismanaged financial resources. (Full article...)
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Business US Highway 41 (Bus. US 41) was astate trunkline highway that served as abusiness loop offUS 41 andM-28 inMarquette, Michigan, along Washington and Front streets. The streets serve thedowntown area of Marquette and are bordered by several commercial properties and businesses. Those two streets originate with the early founding of the city in the middle of the 19th century. Jurisdiction over them was transferred to the city as part of a highway swap that resulted in thedecommissioning of the trunkline in 2005. It was also previously co-designatedBus. M-28, mirroring the Bus. US 41/Bus. M-28 designation previously used alongBus. M-28 inIshpeming andNegaunee. Washington and Front streets had been a part of the state highway system since the 1910s, and a part of theUnited States Numbered Highway System since 1926. The business loop designation dates back to the 1960s and was removed in 2005. (Full article...)

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New York State Route 429 (NY 429) is a north–southstate highway located entirely withinNiagara County, New York, in the United States. It extends for 12.16 miles (19.57 km) from an intersection withNY 265 andNY 384 inNorth Tonawanda to a junction withNY 104 (Ridge Road) on the border between the towns ofCambria andLewiston. Although it is relatively minor in length, the route is regionally important nonetheless as it connects North Tonawanda to some of the county's interior regions. About midway between North Tonawanda and Ridge Road, NY 429 serves thehamlet ofSanborn, where it brieflyoverlaps withNY 31. AtPekin, a community situated between Sanborn and NY 104, NY 429 descends theNiagara Escarpment.

The Sanborn–Ridge Road segment of modern NY 429 was originally designated as part of Route 30, an unsignedlegislative route, in 1908. In the mid-1920s, the portion of Route 30 west ofRochester became part of the signed NY 31; however, NY 31 was realigned in the late 1920s to follow Ridge Road west from Cambria to thevillage of Lewiston. NY 31's former alignment fromNiagara Falls to Ridge Road via Sanborn becameNew York State Route 31A at this time. NY 31A was eliminated in 1935 as part of the establishment ofU.S. Route 104 (US 104). The portion of its former routing north of Sanborn became part of NY 429, which was extended from itsc. 1932 terminus. (Full article...)
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Federal Forest Highway 16 (FFH 16) is aforest highway in the westernUpper Peninsula of the US state ofMichigan that runs through theOttawa National Forest inIron,Houghton andOntonagon counties. TheMichigan Department of Transportation (MDOT) has erroneously marked it asH-16 on their official state map. FFH 16 is designated by theUS Forest Service (USFS) with maintenance shared by the county road commissions (ICRC, HCRC, OCRC, respectively). Although the MDOT maps would suggest that it is a part of theCounty-Designated Highway System (CDH system), it is not. The three counties in question do not participate in the system, and the roadway falls in the middle of the G zone for numbering purposes. (Full article...)
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State Route 370 (SR 370) is 1.21-mile (1.95 km) long north–southstate highway in the western part of theU.S. state ofOhio. The highway runs from its southern terminus at the main entrance toJohn Bryan State Park nearly two miles (3.2 km) southeast ofYellow Springs to its northern terminus atSR 343 about 0.75 miles (1.21 km) east of Yellow Springs.

SR 370 was established in the middle of the 1930s. Aspur route, it connects John Bryan State Park to the state highway system. This two-lane highway is located in the northern portion ofGreene County. (Full article...)
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M-294 is astate trunkline highway inCalhoun County in the US state ofMichigan. It is one of a handful of highways that was established or realigned as a result of a rationalization process initiated in 1998 during the tenure of GovernorJohn Engler. M-294 is approximately two miles (3.2 km) east ofInterstate 194 (I-194) and connectsM-96 withI-94 southeast ofBattle Creek. (Full article...)
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Mississippi Highway 504 (MS 504) is astate highway in centralMississippi. The route starts atMS 15 south ofNewton and travels southeastward. The road turns east at a county road nearGarlandville and travels to its eastern terminus atMS 503 in theunincorporated area ofHero. The route was designated around 1956, from MS 15 to MS 503, and has not changed significantly since. (Full article...)
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State Highway 8, also abbreviated asSH-8 orOK-8, is a highway maintained by theU.S. state ofOklahoma. Because it runs mainly north–south, it has an even number (which is normal for Oklahoma state highways, but opposite from national highways). Highway 8 runs fromU.S. Highway 277 inCyril, Oklahoma to the state line south ofKiowa, Kansas, for a total length of 179.1 miles (288.2 km) The highway has two lettered spur routes.

Highway 8 dates from the creation of the state highway system in 1924. Initially a border-to-border route, it was shortened to its current extent due to encroaching U.S. highways. SH-8 has followed its current route since 1966. (Full article...)
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Interstate 95 (I-95) is anInterstate Highway running along theEast Coast of the United States fromMiami, Florida, north to theCanadian border inHoulton, Maine. In the state ofDelaware, the route runs for 23.43 miles (37.71 km) across theWilmington area in northernNew Castle County from theMaryland state line nearNewark northeast to thePennsylvania state line inClaymont. I-95 is the only primary Interstate Highway that enters Delaware, although it also has two auxiliary routes within the state (I-295 andI-495). Between the Maryland state line andNewport, I-95 follows theDelaware Turnpike (also known as theJohn F. Kennedy Memorial Highway), atoll road with a mainlinetoll plaza near the state line. Near Newport, the Interstate has a large interchange withDelaware Route 141 (DE 141) and the southern termini of I-295 and I-495. I-95 becomes theWilmington Expressway from here to the Pennsylvania state line and heads north through Wilmingtonconcurrently withU.S. Route 202 (US 202). Past Wilmington, I-95 continues northeast to Claymont, where I-495 rejoins the route right before the Pennsylvania state line.

Plans for a road along the I-95 corridor through Wilmington to the Pennsylvania state line predate theInterstate Highway System. After theDelaware Memorial Bridge was built in 1951, the Delaware Turnpike was proposed between the bridge approach nearFarnhurst (present-day interchange between I-95 and I-295) and the Maryland state line near Newark in order to alleviate traffic congestion on parallelUS 40. With thecreation of the Interstate Highway System in 1956, both these roads were incorporated into I-95. Construction on the Delaware Turnpike began in 1957 and ended in 1963. Construction on building I-95 through Wilmington began in the early 1960s. I-95 was completed from Newport north to downtown Wilmington in 1966 and from Wilmington north to the Pennsylvania state line in 1968. Between 1978 and 1980, I-95 was temporarily rerouted along the I-495 bypass route while the South Wilmington Viaduct was reconstructed; during this time, the route through Wilmington was designated asInterstate 895 (I-895). Improvements continue to be made to the highway including widening projects and reconstruction of sections of the road and interchanges. (Full article...)
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New York State Route 254 (NY 254) is astate highway that extends for 6.01 miles (9.67 km) throughWarren andWashington counties in theCapital District ofNew York in the United States. The route runs from exit 19 along theAdirondack Northway (Interstate 87 or I-87) inQueensbury and follows Aviation Road, Quaker Road, and Lower Warren Street through Queensbury toHudson Falls, where it terminates at an intersection withU.S. Route 4 (US 4) in the center of the village.

The portion of NY 254 along Lower Warren Street and River Street has had several designations over the years. From 1924 to 1930, it was part of the originalNY 30. In 1927, it also became part of US 4, which initially overlapped NY 30 from Glens Falls toWhitehall. In the1930 renumbering of state highways in New York, NY 30 was reassigned elsewhere while US 4 was rerouted to bypass Glens Falls to the east. As a result, Lower Warren Street and River Street became part ofNY 32B. (Full article...)
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State Route 139 (SR 139) is astate highway in theU.S. state ofCalifornia. Running fromSR 36 inSusanville north toOregon Route 39 at theOregon state line, it forms part of the shortest route betweenReno, Nevada, andKlamath Falls, Oregon. SR 139 cuts through much ofModoc National Forest and passes nearAntelope Mountain andTule Lake. North of SR 299 nearCanby, SR 139 was built by thefederal government and turned over to the state in about 1940; the remainder was built by a joint highway district ofLassen andModoc Counties, completed in 1956, and given to the state in 1959. (Full article...)
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Route 440 is astate highway inNew Jersey, United States. It comprises two segments, a 5.15-mile (8.29 km)freeway inMiddlesex County linkingInterstate 287 (I-287) and theNew Jersey Turnpike (I-95), inEdison to theOuterbridge Crossing inPerth Amboy and an 8.18-mile (13.16 km) four-lanedivided highway inHudson County running from theBayonne Bridge inBayonne toU.S. Route 1-9 Truck (US 1-9 Truck) inJersey City. These two segments are connected byNew York State Route 440 (NY 440), which runs acrossStaten Island. The freeway portion in Middlesex County is six lanes wide and intersects theGarden State Parkway andUS 9 inWoodbridge Township.

What is now Route 440 was designated as two different routes in 1927: the Middlesex County portion betweenRoute 4 (now Route 35) and the proposed Outerbridge Crossing was designatedRoute S4 (a spur of Route 4) while the Hudson County portion was designated as a part ofRoute 1. In 1953, Route 440 replaced Route S4 as well as Route 1 south of Communipaw Avenue; the number was chosen to match NY 440. A freeway was built for the route in Middlesex County between 1967 and finished in 1972. A freeway was also proposed for the route in Hudson County to fill in the gap between the Bayonne Bridge and West 63rd Street; however, it was never built. In 2001, Route 440 replacedRoute 169 along the Bayonne waterfront. (Full article...)
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Mississippi Highway 37 (MS 37) is astate highway in centralMississippi. The route starts atU.S. Route 84 (US 84) nearCollins. The road travels northward through the town ofTaylorsville, crossing fromCovington County toSmith County. MS 37 turns northwestward and ends atMS 35 inRaleigh. The road first existed as part of MS 35, and it became aspur route of MS 35 by 1941. It was renumbered as MS 37 by 1950, and fully paved by 1952. (Full article...)
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Delaware Route 30 (DE 30) is a state highway inSussex County,Delaware. The route runs from an intersection withDE 24 inMillsboro north toDE 1 Business (DE 1 Bus.) inMilford near the area ofLincoln andCedar Creek. Along the way, DE 30 intersectsU.S. Route 9 (US 9)/DE 404 inGravel Hill,DE 16 west ofMilton, andDE 1 at an interchange in Milford.

What is now DE 30 south of Gravel Hill was built as a state highway in various stages during the 1920s and 1930s. A short-lived DE 30 in the 1930s ran fromDE 20 inSeaford north and east toDE 404 northwest ofBridgeville. The current DE 30 was first designated by 1938 to connect DE 24 in Millsboro toDE 5 in Milton. The route was rerouted to end atDE 14 (now DE 1) south of Milford by 1971. DE 30 was extended southwest from Millsboro to Bi-State Boulevard betweenLaurel andDelmar in 1994, heading southconcurrent with DE 24,DE 26, andDE 54 between Millsboro andGumboro before turning to the west. The route's northern terminus was moved to DE 1 Bus. by way of a new road by 2003. An interchange with DE 1 was completed in 2014. DE 30 formerly had analternate route,DE 30 Alternate (DE 30 Alt.), that was created by 1999 to connect the route withDE 1 by way of Johnson Road and was removed by 2017. In 2022, the southern terminus was cut back to its current location. (Full article...)
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State Route 96 (SR 96), is an east–west, 21.79-mile-long (35.07 km) state highway in central part of theU.S. state ofArizona. It runs fromBagdad east to Yavapai County Road 15 (CR 15) nearHillside. The road was built in the late 1930s and logged as a state route from Bagdad to Hillside in 1962. The section from Bagdad to SR 97 was never officially part of the State Highway system, though the remainder of the highway was officially designated as such at the turn of the century. (Full article...)
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State Route 225 (SR 225) is an 11.32-mile (18.22 km) long two-lanestate highway located entirely inBenton County,Washington, United States. The highway travels over theBenton City – Kiona Bridge, which is listed on the Washington Heritage Register andNational Register of Historic Places, over theYakima River. After turning throughBenton City, the highway parallels the river for the remainder of the route. Several different proposals have been introduced to alleviate traffic flow issues at theSR 224 / SR 225 interchange, which was ultimately replaced with aroundabout in 2016. (Full article...)
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Interstate 91 (I-91) is anInterstate Highway in theNew England region of the United States. It is the primary north–south thoroughfare in the western part of the region. Its southern terminus is inNew Haven, Connecticut, atI-95, while the northern terminus is inDerby Line, Vermont, at theCanada–United States border. Past theDerby Line–Rock Island Border Crossing, the road continues into Canada asQuebec Autoroute 55. I-91 is the longest of three Interstate highways whose entire route is located within the New England states (the other two highways beingI-89 andI-93) and is also the only primary (two-digit) Interstate Highway in New England to intersect all five of the other highways that run through the region. The largest cities along its route, from south to north, areNew Haven, Connecticut;Hartford, Connecticut;Springfield, Massachusetts;Northampton, Massachusetts;Greenfield, Massachusetts;Brattleboro, Vermont;White River Junction, Vermont;St. Johnsbury, Vermont; andNewport, Vermont. (Full article...)

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October 1:TheBella Vista Bypass is opened to traffic, makingInterstate 49 complete fromKansas City, Missouri toFort Smith, Arkansas.^[1]
April 6: Work begins on covering the abandoned section ofPennsylvania Route 61 inCentralia, known as "Graffiti Highway", with dirt in order to block public access.^[2]^[3]
October 3:Nevada Department of Transportation begins renumbering the exits alongInterstate 580, which originally reflected mileage along concurrentU.S. Route 395, to reflect mileage along the Interstate designation.^[4]
June 1: The first portion of the I-77 ExpressHOT lanes alongInterstate 77 inNorth Carolina opened between Hambright Road inHuntersville andNC 150 inMooresville.^[5]
February 4: Anew highway tunnel opens in downtownSeattle to carry a section ofWashington State Route 99, replacing the recently-closedAlaskan Way Viaduct. It cost $3.3 billion to construct and took over five years due to delays with itstunnel boring machine,Bertha.^[6]
January 10: TheU.S. Route 301 toll road inDelaware between theMaryland border southwest ofMiddletown andDelaware Route 1 inBiddles Corner opens to traffic. The toll road is the first in Delaware to useall-electronic tolling, with tolls paid byE-ZPass ortoll-by-plate.^[7]
November 21: TheU.S. Route 219 freeway betweenMeyersdale andSomerset inSomerset County, Pennsylvania opens to traffic.^[8]
November 7: The section ofTexas State Highway Loop 49 bypassingLindale fromInterstate 20 north toU.S. Route 69 opens to traffic.^[9]
October 13: A groundbreaking ceremony is held for the realignment ofU.S. Route 219 betweenInterstate 68 and Old Salisbury Road inGarrett County, Maryland, with GovernorLarry Hogan in attendance.^[10]

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