Route Description
The New York State Thruway system is a collection of six individual components across the state of New York that connect the state to four neighboring states (Connecticut, Massachusetts, New Jersey, and Pennsylvania) as well as the Canadian province of Ontario. Together, the highways extend for 569.83 miles (917.05 km), making the Thruway system one of the largest toll highway systems in the United States. The longest of the six components is the 496-mile (798 km) mainline. Of the 570 miles in the Thruway system, 560.85 miles (902.60 km) (98.4%) carries at least one Interstate Highway designation. Only three sections of the system are not part of the Interstate Highway System; these are the Garden State Parkway Connector in Rockland County, a 6-mile (10 km) portion of the Berkshire Connector between exit 21A on the mainline near Selkirk and exit B1 in Schodack, and a short section of the mainline within exit 24 in Albany that is located between where I-87 departs the roadway and I-90 enters it. They are designated as New York State Route 982L (NY 982L), NY 912M, and NY 915H, respectively, all unsigned reference routes.
I-90, which comprises the bulk of the mainline and the Berkshire Connector, runs for 365.55 miles (588.30 km) along the Thruway: 17.70 miles (28.49 km) as part of the Berkshire Connector and 347.85 miles (559.81 km) on the mainline. I-87 comprises the remaining 148.15 miles (238.42 km) of the mainline, including an 18.86-mile (30.35 km) concurrency with I-287 north of New York City. I-287 covers another 29.76 miles (47.89 km) (including the 18.86 miles (30.35 km) shared with I-87), while I-190 spans 21.24 miles (34.18 km) and I-95 covers 15.01 miles (24.16 km).
All highways maintained by the New York State Thruway Authority (NYSTA) lack the reference markers that exist on all New York State Department of Transportation-maintained roads, as would be expected. In their place, NYSTA-controlled roadways use small, square tenth-mile markers with a white background and blue numbering. These markers differ from the white-on-green reference markers used by NYSDOT on state-maintained highways, which are 10 inches (254 mm) high and 8 inches (203 mm) wide and display a limited amount of mileage information on their third row.
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