 At the New York City – Yonkers border , I @-@ 87 changes to the New York State Thruway as the mainline proceeds northward through Yonkers and southern Westchester County . It connects with Central Park Avenue ( NY 100 ) at exit 1 , the first of 12 exits within the county . The first few exits serve various local streets , with exit 2 providing access to Yonkers Raceway and exit 3 serving the Cross County Shopping Center . At exit 4 , I @-@ 87 connects to the Cross County Parkway , an east – west parkway providing access to the Saw Mill River , Bronx River , and Hutchinson River parkways . The north @-@ south parkways and I @-@ 95 run parallel to the Thruway through Southern Westchester . The Bronx River parkway leaves to the northeast midway through Yonkers , while the Saw Mill and Sprain Brook parkways follow the Thruway out of the city . 
