Interstate 70 (I-70) in the US state of Pennsylvania runs east–west across the southwest part of the state serving the southern fringe of the Pittsburgh metropolitan area. About half of the route is concurrent with I-76 on the Pennsylvania Turnpike, which is a toll road. This is the oldest segment of I-70 in Pennsylvania, having been completed in 1940, and is only one of two segments of I-70 that are tolled, with the other being the Kansas Turnpike. I-70 is one of only a few Interstate Highways to have a traffic signal—in this case, with U.S. Route 30 (US 30) in Breezewood, where it leaves the Pennsylvania Turnpike and heads toward Maryland. Route description Two segments of I-70 in Pennsylvania are not designed to modern Interstate standards: a segment from Washington to New Stanton and the aforementioned half-mile () signalized segment in Breezewood. West Virginia to Washington I-70 enters Pennsylvania from West Virginia, coming into Donegal Township, Washington County. The highway continues northeast as a four-lane freeway with a standard-size median up to Interstate Highway standards through rural areas of woodland and farmland, coming to its first junction at a partial cloverleaf interchange with State Route 3023 (SR 3023), to the southeast of unincorporated village of West Alexander. Past this junction, the freeway begins to parallel US 40 on the northwest side of the road, before it enters a series of winding curves. From here, I-70 heads east to meet a weigh station and a welcome center in the eastbound direction, as well as an interchange with SR 3024 connecting to Pennsylvania Route 231 (PA 231) via US 40 in the borough of Claysville. The freeway curves to a more east-northeasterly direction, where it briefly passes through the borough limits of Claysville, before briefly reentering Donegal Township. I-70 enters Buffalo Township, where it soon meets a pair of right-in/right-out ramps connecting to PA 221, that serves the unincorporated village of Taylorstown to the northeast, in adjacent Blaine Township. The freeway comes into North Franklin Township before crossing into Canton Township at its partial interchange with US 40 which lacks a westbound entrance; the interchange is adjacent to the Washington Crown Center shopping mall located to the southwest of the interchange. From here, I-70 crosses over an abandoned portion of the Allegheny Valley Railroad's W&P Subdivision line and enters mixed areas of development on the outskirts of the city of Washington,