thumb|left|Looking east along I-87/I-287 (the Thruway) toward the Tappan Zee Bridge from Nordkop Mountain in Suffern At the New York City–Yonkers border, I-87's mainline continues onto the New York State Thruway and northward through Yonkers and southern Westchester County. The first few exits serve various local streets, with exit 1 serving Hall Place, exit 2 providing access to Yonkers Raceway & Empire City Casino 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.
ThumB|lEft|LookINg eaST ALOnG i-87/i-287 (the thruway) tOward ThE Tappan Zee briDge from norDKoP moUNtAIn In Suffern at tHe New york city–yonKErs bordEr, i-87's mAInliNe cONTiNues onto The NEw york State thRuwaY and nortHWARd throUgH YonkerS and SouThern wEstCHestEr couNty. the fIRst fEw exits sErVE VariOus lOcal Streets, wiTh eXit 1 seRviNg HAll place, exIT 2 provIdINg ACcESs To Yonkers rAceWaY & eMPiRe CIty casino 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.