I-287 Highway in Greenburgh — Live Traffic Webcam

Where This Interchange Is Located

The camera is installed at Exit 4 of Interstate I-287 — Cross Westchester Expressway — at the junction with Knollwood Road in the town of Greenburgh, Westchester County, New York. This node connects the expressway with NY 100A and provides access to Sprain Brook Parkway. The area features dense mixed development — from forested areas to commercial zones in Elmsford and White Plains.

Transportation Role in Westchester County

Interstate 287 is a key bypass route of the New York metropolitan area, connecting New York State Thruway (I-87) with I-95 across all of Westchester County. The Knollwood Road exit serves a significant flow of commercial and passenger vehicles: the area features office parks, business centers, and Knollwood Country Club. The interchange is integrated into the ramp meter system that regulates entry onto the expressway.

Ramp Meter and Flow Control

In 2018, a ramp meter was installed at the Knollwood Road on-ramp to I-287 — a control signal that meters the flow of vehicles entering the main expressway. The system is part of a network of 13 ramp meters in Westchester and Rockland counties. Sensors monitor ramp congestion and allow vehicles through one at a time, preventing backups on the main lanes. This is especially noticeable during peak hours when the queue to enter can stretch along Knollwood Road.

Highway Design at This Location

Cross Westchester Expressway near Exit 4 is a six-lane highway (three lanes in each direction) with a median divider. The speed limit is 55 mph (about 88 km/h). To the right of the road is a dense forested buffer separating the highway from residential neighborhoods; to the left is urban development with commercial buildings. The exit ramp has a right-side lane for traffic heading to Sprain Brook Parkway; drivers heading west on I-287 merge from the left.

History of Cross Westchester Expressway

Originally, the highway was designed as I-487 — this designation appeared on maps in 1960. In 1969, the route was redesignated as I-287, and the northern section to Brewster was incorporated into I-87. In the 2010s, a major reconstruction project spanning approximately 1.8 miles was completed with a budget of $150 million — upgrading pavement, drainage systems, and safety features.

Infrastructure Around the Interchange

Knollwood Road is an important commercial artery in Greenburgh. Office buildings line the road, including business complexes at 297 Knollwood Road, restaurants, and hotels. Proximity to Sprain Brook Parkway enhances the area's appeal for business. In 2018, the Knollwood Road ramp was used for critical Con Edison fiber optic installation work — the project required temporary lane closures.

What You Can See on the Camera

The camera is mounted on an elevated position and covers the multi-lane Cross Westchester Expressway with moving car and truck traffic. Visible are the median divider, guardrails, barriers, and road markings. To the right is a dense tree line; to the left is urban development. The image includes a text overlay showing the highway designation and exit number. During peak hours, the ramp meter operation at the Knollwood Road on-ramp is clearly visible — vehicles merge into the main I-287 flow one by one.