From Pennsylvania:
Take I-78 E and cross into New Jersey
Merge onto I-287 S via Exit 29 toward US-202 S/SOMERVILLE/US-206 S.
Merge onto US-202 S/US-206 S via Exit 17 toward US-22 W/SOMERVILLE/FLEMINGTON.

From I-95 North:
Merge onto NJ-18N via exit 9 toward US-1/NEW BRUNSWICK/PRINCETON/TRENTON/TOWER CENTER BLVD.
Continue straight to NJ-18 N.
Take NJ-18N toward PISCATAWAY.
Follow the River Road ramp toward PISCATAWAY/HIGHLAND PK.
Merge onto CR-622 W/RIVER RD.
Merge onto I-287 N.
Merge onto US-22 W via left Exit 14B toward US-202/CLINTON/US-206.
Merge onto US-202 S/US-206 S toward FLEMINGTON/PRINCETON.