New York State Route 120A
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Map of southern Westchester County with NY 120A highlighted in red
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| Route information | ||||
| Auxiliary route of NY 120 | ||||
| Maintained by NYSDOT, Westchester County and the village of Port Chester | ||||
| Length: | 8.55 mi (13.76 km) | |||
| Existed: | c. 1931 – present | |||
| Major junctions | ||||
| South end: |
 NY 120 in Harrison, NY
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   Hutchinson River Parkway / Route 15 / Merritt Parkway on the Rye Brook, NY–Greenwich, CT line |
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| North end: |
NY 120 in North Castle, NY
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| Location | ||||
| Counties: | Westchester (NY), Fairfield (CT) | |||
| Highway system | ||||
State Routes in Connecticut
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New York State Route 120A (NY 120A) is a state highway in southern Westchester County, New York, in the United States. It serves as an alternate route to the southern half of NY 120 running along the New York–Connecticut state line. The southern terminus of route is at NY 120 in Harrison. Its northern terminus is at NY 120 in North Castle. Most of the 8.55-mile (13.76 km) route straddles the New York–Connecticut state line, and part of the route is physically located in Connecticut. However, this part of the highway is not recognized by Connecticut as "Route 120A", and is considered to be part of NY 120A by the New York State Department of Transportation (NYSDOT).
NY 120A begins at an intersection with NY 120 next to I-287 (the Cross-Westchester Expressway) in the village of Harrison. Although the route is signed north–south, it initially heads east along Westchester Avenue, overlapping with the northbound direction of NY 120 for 0.08 miles (0.13 km) as the road passes under I-287. East of the freeway overpass, NY 120 leaves to the northwest while NY 120A continues eastward on the four-lane Westchester Avenue. It serves residential areas until it crosses into Rye Brook, where the street makes a turn to the southeast and soon enters more commercialized neighborhoods. In the center of Rye Brook, the route meets Ridge Street (unsigned County Route 54 or CR 54). The businesses give way to homes east of the junction, and NY 120A passes into the village of Port Chester just three blocks from Ridge Street near an intersection with Bowman Avenue (CR 104).
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