First, Martorelli Stadium is not located at or around North Hills High School. It is located on the outskirts of West View not far from the PAT Bus Garage on Perry Highway (Rt 19).
To get there, cross the Sewickley Bridge and turn right onto Ohio River Blvd (Rt 65) toward Pittsburgh and follow it for approximately 5 miles to the intersection with Camp Horne Road (Green Belt). There is a BP Gas Station at the intersection. Turn left onto Camp Horne Road and follow it for approximately 2 miles through the Avonworth area. Turn right onto the entrance ramp to I-279 South toward Pittsburgh and follow it for three miles to Exit 12 (Perrysville Highway). Get off at Exit 12, turn left at top of ramp and cross over I-279 to the intersection with Perrysville Highway (Route 19). Turn left onto Route 19 and travel approximately 7/10 mile. Stadium will be on your right. Parking Lot space is limited so get there early. Some parking allowed along Perrysville Highway. See map below. Driving time is about 30 minutes.