Ardsley Road is an east/west route extending from Ardsley to Scarsdale. It exists as a local street from Ardsley to Greenburgh. At Central Park Avenue (NY 100) in Greenburgh, it becomes CR 78. After about half a mile, it descends a small switchback. At the bottom, there is an interchange with the Bronx Parkway, and Ardsley Road changes designation to become CR 78A.
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