75 Pa.C.S. § 3344

Unless otherwise directed by official traffic-control devices erected in accordance with provisions of Subchapter B of Chapter 31 (relating to traffic-control devices), the driver of a vehicle emerging from an alley, building, private road or driveway within an urban district shall stop the vehicle immediately prior to driving onto a sidewalk or onto the sidewalk area extending across the alley, building entrance, private road or driveway or, in the event there is no sidewalk area, shall stop at the point nearest the street to be entered where the driver has a view of approaching traffic.