New York State Route 125

State highway in Westchester County, New York, US
It briefly runs along the eastern edge of New Rochelle's Pinebrook Heights and Pinebrook neighborhoods ahead of a partial interchange with the Hutchinson River Parkway (exit 20) in the Quaker Ridge section of New Rochelle. Access to the Parkway northbound is via Hutchinson Avenue. NY 125 continues directly into the center of Heathcote, where it turns northeast onto Palmer Avenue at an intersection known locally as the Five Corners. The route continues northeastward for several blocks before gradually turning back to the north as it heads into nearby Secor Gardens. as it turns northwest through downtown White Plains. The route continues for another three blocks to its north end at junction with NY 22 (East Post Road), several blocks south of NY 119 (Main Street). The remainder of the route in Mamaroneck was added in the mid 1920s, and the 0.3 mile (0 km) segment leading south from the White Plains city line was taken over by the state sometime after 1926. NY 125 was assigned as part of the 1930 renumbering of state highways in New York. It began at US 1 and went north over the state highways in Mamaroneck and Scarsdale and locally maintained streets in New Rochelle and White Plains to Mamaroneck Avenue, then NY 126. The NY 126 designation was removed c. 1936, at which time NY 125 was extended north to NY 22. In the mid 20th century, the route was proposed to be realigned onto an expressway loosely following the Bronx River Parkway and NY 22 between the Bronx and White Plains. While the parkway was restricted to non commercial vehicles, the proposed highway was intended to serve vehicles of all types. The proposal was abandoned in the 1960s. Part of the expressway's planned route along the former right of way of the New York, Westchester and Boston Railway's line to White Plains was eventually used for the Heathcote Bypass in the mid 1960s.

New York State Route 125 Bypass (NY 125 Bypass), also known as the Heathcote Bypass, is a bypass of a section of NY 125 along Weaver Street, Palmer Avenue, and Secor Road. The bypass was built on the roadbed of the former New York, Westchester and Boston Railway. The road travels below grade, passing Wilmont, Heathcote, and Mamaroneck Roads. The road's terminals are at stoplight controlled intersections with slip ramps for the southbound lanes, which allow complete southbound travel through the bypass without stopping. The route is co designated, but not signed, as County Route 143.