Winding up the hills of White Plains, the route crosses through the North Street section, becoming a four-lane residential street past White Plains Senior High School.
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The route bends northwest through a residential section of Harrison, reaching a junction with the Hutchinson River Parkway (exit 25).
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A mile past that junction and downtown, NY 127, also bound for White Plains, forks left at Keeler Avenue as 1 itself begins to trend more to the east into Rye, passing Rye Neck High School at the town line.