Location details here:
A Small Plane Made An Emergency Landing On The Major Deegan Expressway - Business Insider
Inbound to LaGuardia, landed on the north-bound side of the Major Deegan Expressway near the East 233rd St. exit (I-87 exit 13).
Looks to be about here:
http://goo.gl/maps/R2oCg
Appears to be about 7nm from the airport.