The New York State Department of Transportation (NYSDOT) is responsible for the establishment and classification of a state highway network which includes Interstate Highways, U.S. Highways, and state routes. U.S. and Interstate Highways are classified as state routes in New York; however, a letter ("U" or "I", respectively) is suffixed to the number of the route. As a result, there is apparent duplication between U.S. Routes, Interstate Highways and state routes.
The New York state highway system is supplemented by the state's county route system, which comprises a series of highways numbered and maintained by the individual county highway departments. While neighboring New Jersey employs a statewide numbering system, no such system exists in New York. Instead, each county numbers its highways independently of other counties. As a result, county routes typically change numbers when they cross county lines.
In some cases, the state highway and county highway systems overlap. More specifically, some portions of U.S. Routes and state routes in New York are signed as U.S. Routes or state routes but are maintained by the county that the route lies within. These county-maintained segments also carry a county route designation that may or may not be posted alongside the U.S. or state designation, depending on the signing practices of the county. Some state routes, such as New York State Route 148 in Niagara County, are entirely county-maintained.
A "Welcome to New York" sign on I-84 westbound, entering from Connecticut.
Highways maintained by the New York State Thruway Authority lack any signed numbers apart from Interstate Highway designations. While the vast majority of the Thruway system is part of the Interstate Highway System, some sections, such as the Berkshire Connector between Interstate 87 and Interstate 90, are unsigned reference routes. There are no standard NYSDOT reference markers on any of the highways; instead, the Thruway Authority posts their own mileposts, which (aside from the mainline) bear special Thruway codes.
The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.
The New York State Thruway is a system of controlled-access highways spanning 569.83 miles (917.05 km) within the U.S. state of New York. It is operated by the New York State Thruway Authority (NYSTA), a New York State public-benefit corporation. The 496.00-mile (798.23 km) mainline is a toll road that extends from the New York City line at Yonkers to the Pennsylvania state line at Ripley by way of I-87 and I-90 through Albany, Syracuse, and Buffalo. According to the International Bridge, Tunnel and Turnpike Association, the Thruway is the fifth-busiest toll road in the United States.
Interstate 84 (I-84) is an Interstate Highway in the northeastern United States that extends from Dunmore, Pennsylvania, at an interchange with I-81 east to Sturbridge, Massachusetts, at an interchange with the Massachusetts Turnpike (I-90). Among the major cities that the road passes through is Hartford, Connecticut. Another highway named I-84 is located in the northwestern United States.
Interstate 88 (I-88) is an Interstate Highway located entirely within the U.S. state of New York. Nominally signed as an east–west road as it has an even number, it extends for 117.70 miles (189.42 km) in a northeast–southwest direction from an interchange with I-81 north of Binghamton to an interchange with the New York State Thruway (I-90) west of Schenectady. The freeway serves as an important connector route from the Capital District to Binghamton, Elmira, and Scranton, Pennsylvania. I-88 closely parallels NY 7, which was once the main route through the area.
Interstate 86 (I-86) is an Interstate Highway that extends for 222.26 miles (358 km) through northwestern Pennsylvania and the Southern Tier region of New York, in the United States. The highway has two segments: the longer of the two begins at an interchange with I-90 east of Erie, Pennsylvania, and ends just beyond the Chemung-Tioga County line at the Pennsylvania border, while the second extends from I-81 east of Binghamton to New York State Route 79 (NY 79) in Windsor. When projects to upgrade the existing NY 17 to Interstate Highway standards are completed, I-86 will extend from I-90 near Erie to the New York State Thruway (I-87) in Woodbury. The portion in Erie County, PA is known as the Hopkins-Bowser Highway and is signed as such at each end. In New York, the current and future alignment of I-86 is known as the Southern Tier Expressway west of I-81 in Binghamton and the Quickway east of I-81.
Interstate 190 is a north–south auxiliary Interstate Highway that connects I-90 in Buffalo, New York with the Canada-U.S. border near Niagara Falls. The freeway bisects downtown Buffalo before crossing Grand Island and travelling around the outskirts of Niagara Falls before crossing the Niagara River on the Queenston-Lewiston Bridge into Ontario. On the Canada side of the Canada–US border, the freeway continues as Highway 405, a short spur that connects with the Queen Elizabeth Way (QEW), which in turn provides a freeway connection to Toronto, Canada's largest city. The 28.34-mile-long (45.61 km) route also provides access to the QEW at the Peace Bridge between Buffalo and Fort Erie, Ontario.
New York State Route 878 (NY 878) is a state highway on Long Island and in New York City. The route exists in two sections, which both form the Nassau Expressway. NY 878's western terminus is the Belt Parkway and Conduit Avenue (NY 27) in Ozone Park, within southern Queens. Its southern terminus is immediately before the Village of Atlantic Beach, at the Atlantic Beach Bridge in Lawrence, within southwestern Nassau County. NY 878 is discontinuous between Farmers Boulevard in Queens and the town of Inwood in Nassau County. The two sections are connected to each other by Rockaway Boulevard and Rockaway Turnpike.
The state highway system of the U.S. state of Oregon is a network of highways that are owned and maintained by the Highway Division of the Oregon Department of Transportation (ODOT).
Interstate 95 (I-95) is part of the Interstate Highway System and runs from Miami, Florida, to the Canada–United States border near Houlton, Maine. In the U.S. state of New York, I-95 extends 23.50 miles (37.82 km) from the George Washington Bridge in New York City to the Connecticut state line at Port Chester. From the George Washington Bridge, which carries I-95 across the Hudson River from New Jersey into New York City, it runs across upper Manhattan on the Trans-Manhattan Expressway and continues east across the Harlem River on the Alexander Hamilton Bridge and onto the Cross Bronx Expressway. In the Bronx, I-95 leaves the Cross Bronx at the Bruckner Interchange, joining the Bruckner Expressway to its end. North of the interchange with Pelham Parkway, it then continues northeast via the New England Thruway out of New York City into Westchester County and to the Connecticut state line, where I-95 continues on the Connecticut Turnpike.
New York State Route 324 (NY 324) is an east–west state highway located in the western portion of New York in the United States. Officially, NY 324 begins at NY 384 in Niagara Falls and overlaps Interstate 190 south to Grand Island, where it separates from I-190 and continues southward as Grand Island Boulevard. As signed, however, NY 324 begins at the southern end of the official overlap and is contained entirely within Erie County. At the southern edge of Grand Island, NY 324 joins I-190 to cross over to the mainland, where it runs due east across three towns before reaching its eastern end at a junction with NY 5 in the town of Clarence.
New York State Route 437 (NY 437) is a state highway located south of Auburn in Cayuga County, New York, in the United States. At 0.30 miles (0.48 km) in length, it is the shortest signed state route in New York. It is a brief connector route between NY 38 and NY 38A known locally as White Bridge Road. The highway allows motorists, especially those wanting quick access to the opposite side of nearby Owasco Lake, to avoid having to cross the Owasco Outlet further downstream, in the city. NY 437 was assigned in 1970; however, the designation had appeared on maps of the area as early as two decades before.
The North Carolina Highway System consists of a vast network of Interstate, United States, and state highways, managed by the North Carolina Department of Transportation. North Carolina has the second largest state maintained highway network in the United States because all roads in North Carolina are maintained by either municipalities or the state. Since counties do not maintain roads, there is no such thing as a "county road" within the state.
New York State Route 920P (NY 920P) is an unsigned reference route designation for Riverside Drive in the Montgomery County town of Glen, New York, in the United States. The roadway connects NY 30A and NY 5S to exit 28 of the New York State Thruway in the village of Fultonville. Most of Riverside Drive runs alongside the Mohawk River. Although the route is inventoried by the New York State Department of Transportation (NYSDOT) as NY 920P, the reference markers bear the number 862.
An unsigned highway is a highway that has been assigned a route number, but does not bear road markings that would conventionally be used to identify the route with that number. Highways are left unsigned for a variety of reasons, and examples are found throughout the world. Depending on the policy of the agency that maintains the highway, and the reason for not signing the route, the route may instead be signed a different designation from its actual number, with small inventory markers for internal use, or with nothing at all.
In the United States, exit numbers are assigned to freeway junctions, and are usually numbered as exits from freeways. Exit numbers generally are found above the destinations of the exit, as well as a sign in the gore. Exit numbers typically reset at political borders such as state lines. Some major streets also use exit numbers. Freeway exits in the United States are usually numbered in two formats: distance-based and sequential.
In New York, a reference marker is a small green sign mounted approximately every one-tenth mile on highways maintained by the New York State Department of Transportation. This was initiated in response to the Highway Safety Act of 1966 enacted by Congress, in an effort to monitor traffic and identify high-accident locations. New York's system inventories and indexes all touring and reference routes, in addition to service and rest areas, ramps, and reservation roads.
Interstate 84 (I-84) is a part of the Interstate Highway System that runs from Dunmore, Pennsylvania, to Sturbridge, Massachusetts, in the eastern United States. In New York, I-84 extends 71.46 miles (115.00 km) from the Pennsylvania state line at Port Jervis to the Connecticut state line east of Brewster. As it heads east–west across the mid Hudson Valley, it goes over two mountain ranges and crosses the Hudson River at the Newburgh–Beacon Bridge.
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