How does one get here?
The exit ramp is about a 1/2 mile from end to end.
A vehicle might enter off the Henry Hudson Parkway near the 119th Street Tennis Courts in Riverside Park. On the HHP there's an Exit sign that says to go to 125th Street.
Alternately one can walk or bike to it via the desire line on 119th Street Tennis Courts in Riverside Park or walk or bike to it at its exit at St. Clair Place and 12th Avenue. From the point you enter right about the Riverside Park Meadow or pollinator garden about 1/3rd of the ramp lies to the south of you and the other 2/3rds to the north. Its quite long. I'd say uncharacteristicly long.
To get to the area one might take the #1 train to the 125th Street stop and then walk west on 125th Street and then make a slight right onto St. Clai Place. If you stay on the south sidewalk you'll run into it.