The Pennsylvania Turnpike is a toll highway system operated by the Pennsylvania Turnpike Commission in the state of Pennsylvania, United States. The turnpike system encompasses 532 miles (855 km) in three sections. Its main section, extending from the Ohio state line in the west to the New Jersey state line in the east, is 359 miles (578 km). Its Northeast Extension, extending from Plymouth Meeting in the southeast to Wilkes-Barre and Scranton in the northeast, is 110 miles (177 km). Its various access segments in Western Pennsylvania total 62 miles (100 km). The highway serves most of Pennsylvania's major urban areas. The main east/west section serves the Pittsburgh, Harrisburg, and Philadelphia areas, while its Northeastern Extension serves the Allentown/Bethlehem and Scranton/Wilkes-Barre areas. This 360-mile highway allows an optional way of paying called E-ZPass, in which tolls are paid electronically through a transmitter attached to the car behind its rear-view mirror.