The highway connects I-84 with I-287 and the Hutchinson River Parkway, primarily serving commuter traffic to and from the northern suburbs of the New York metropolitan area.
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The other, designated as New York State Route 984J (NY 984J) but still signed I-684, begins in Harrison at exit 26A of the Hutchinson River Parkway and has one independent exit with Manhattanville Road before joining with the I-287 spur into one route.
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