The Babylon-Northport Expressway was planned as a limited-access highway from Montauk Highway (NY 27A) in Babylon to Fort Salonga Road (NY 25A) in Northport. It was intended to carry the NY 231 designation for its entire length. The southernmost segment of the proposed expressway was constructed, beginning at Montauk Highway and ending just south of the Southern Parkway. North of this point, the NY 231 designation was assigned to Deer Park Avenue and Deer Park Road, which were formerly county roads. This designation was intended to be temporary. It would be removed after the remainder of the expressway was constructed. However, this never actually happened, so the temporary designation became permanent. Like the Seaford-Oyster Bay Expressway (NY 135), which does not go to Oyster Bay, the Babylon-Northport Expressway does not go to Northport. Just north of the interchange with the Northern Parkway in Dix Hills, Deer Park Road splits into Deer Park Road (CR 35) and East Deer Park Road (CR 66). The NY 231 designation ends at this point.
Copyright © 2003-2019 by David Golub. All rights reserved. The author would like to thank William Roll for contributing photographs and LC for contributing documents to this web site. You may not reproduce any text or photographs on this web site without express permission from the author. Hotlinking of images from this site is strictly prohibited. Route symbols based on graphics from Central PA/MD Roads and Wikipedia.