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.
Exit numbering on I-86 was that of the road's predecessor, Route 15, in a sequence beginning on New York's Hutchinson River Parkway.
The route bends northwest through a residential section of Harrison, reaching a junction with the Hutchinson River Parkway (exit 25).
Mississippi River | River Thames | Amazon River | Columbia River | Hudson River | Colorado River | Potomac River | river | Ohio River | Missouri River | Delaware River | Murray River | River Tyne | Madeira River | Volga River | River Nene | River Clyde | River Trent | River Severn | Amur River | River Wear | Allegheny River | Red River | Dnieper River | Yarra River | Paraná River | River Tees | Fraser River | Yangtze River | Tocantins River |