The Pennsylvania Turnpike is a toll road (a road cars have to pay to drive on) operated by the Pennsylvania Turnpike Commission in the Commonwealth of Pennsylvania in the United States. It costs more than $7 for a car to enter it from Ohio. The turnpike is a limited-access highway, which means cars must use ramps to get onto the highway. It runs across the state. The turnpike begins at the Ohio border in Lawrence County, where it goes into that state as the Ohio Turnpike. The designation ends at the New Jersey border at the Delaware River – Turnpike Toll Bridge over the Delaware River in Bucks County, where it goes into that state as the Pearl Harbor Memorial Extension of the New Jersey Turnpike. The roadway goes east-west path through the state, going through the Pittsburgh, Harrisburg, and Philadelphia areas. As it goes across the Appalachian Mountains in the middle of the state, the turnpike goes through four tunnels. It is part of the Interstate Highway System and is signed as part of Interstate 76 (I-76) between the Ohio border and Valley Forge, I-70 and I-76 between New Stanton and Breezewood, I-276 between Valley Forge and Bristol Township, and I-95 between Bristol Township and the New Jersey border. The road uses a ticket system of tolling, where cars get a ticket listing fares when they head onto the road and pay when they leave the road, between the Warrendale and Neshaminy Falls toll plazas. There is also an eastbound toll plaza at Gateway near the Ohio border and a westbound toll plaza at the Delaware River Bridge that uses cameras to take a picture of the car's license plate and send a bill in the mail. E-ZPass, a form of electronic toll collection, is also used at all toll plazas.