Interchange of the Week
Monday, 10 September 2001
NY 9A, NY 100, NY 117 & Taconic State Parkway, Pleasantville
A full-size image (407 KB) is also available.

Orientation: The Taconic State Parkway runs from bottom right to top left. Immediately parallel on its left runs the Briarcliff-Peekskill Parkway, carrying the overlapping designations of NY 9A and NY 100. NY 117 runs from left to right, and NY 448 branches from it towards lower left.

The interchange: Just to the north of the Hawthorne complex of interchanges (see Week 49), the Taconic and Briarcliff-Peekskill Parkways run closely parallel for a short distance. Within this stretch, both roadways have an interchange with NY 117. At this junction, both parkways have widened medians, with the result that the northbound Briarcliff-Peekskill and southbound Taconic Parkway lanes are directly adjacent to each other, sharing an underpass with NY 117. This also creates a "wrong-side drive" situation, where opposing traffic streams pass on the left rather than the right (see also Week 2 and Week 47).

The Taconic State Parkway's junction with NY 117 involves only the northbound parkway, where half of a "folded" diamond, or a quarter-cloverleaf, provides the connection. Southbound connections with local roads are somewhat lacking in this area; they are best made just to the north at the Pleasantville Road interchange.

More unusual is the Briarcliff-Peekskill Parkway interchange, a rare interior diamond configuration. In this setup, all entrance and exit ramps fall within the median of the parkway and meet the cross road at a single point between two overpasses. This single intersection is advantageous in congested or high-traffic areas, but the left-hand exit and entrance patterns are considered to be a severe shortcoming. A widely accepted solution to this problem is the Single Point Urban Interchange, or SPUI, an example of which has since appeared on Long Island.

Other connections: There is also an interchange between the two parkways here, consisting of a single ramp from the northbound Taconic to the northbound Briarcliff-Peekskill Parkway. The presence of this ramp eliminates the need to use surface streets at Hawthorne. The other north-to-north movement, from the Briarcliff-Peekskill to the Taconic Parkway, cannot be made at Hawthorne, and so must be made either at Pleasantville Road, or to the south via the Saw Mill River Parkway.

Taconic State Parkway and
Briarcliff-Peekskill Parkway at Steve Anderson's Also link to the Phelps Way (NY 117) page.

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