Allegheny County is a county in Pennsylvania, United States. As of the 2020 census, the population was 1,250,578, making it the state's second-most populous county, after Philadelphia County. Its county seat and most populous city is Pittsburgh, Pennsylvania's second most populous city. The county is part of the Greater Pittsburgh region of the state, and is the center of the Pittsburgh media market.
A bridge to nowhere is a bridge where one or both ends are broken, incomplete, or unconnected to any roads. If it is an overpass or an interchange, the term overpass to nowhere or interchange to nowhere may be used respectively.
Downtown Pittsburgh, colloquially referred to as the Golden Triangle, and officially the Central Business District, is the urban downtown center of Pittsburgh, Pennsylvania, United States. It is located at the confluence of the Allegheny River and the Monongahela River whose joining forms the Ohio River. The triangle is bounded by the two rivers.
Interstate 279 (I-279), locally referred to as Parkway North, is a north–south auxiliary Interstate Highway that lies entirely within Allegheny County, Pennsylvania. Its southern end is at I-376 at the Fort Pitt Bridge in Pittsburgh, and the north end is in Franklin Park at I-79. It primarily serves at the main access route between Pittsburgh and its northern suburbs.
Interstate 376 (I-376) is a major auxiliary route of the Interstate Highway System in the US state of Pennsylvania, located within the Allegheny Plateau. It runs from I-80 near Sharon south and east to a junction with the Pennsylvania Turnpike in Monroeville, after having crossed the Pennsylvania Turnpike at an interchange in Big Beaver. The route serves Pittsburgh and its surrounding areas and is the main access road to Pittsburgh International Airport (PIT). Portions of the route are known as the Beaver Valley Expressway, Southern Expressway, and Airport Parkway. Within Allegheny County, the route runs along the majority of the Penn-Lincoln Parkway, known locally as Parkway West and Parkway East. It is currently the ninth-longest auxiliary Interstate route in the system and second only to I-476 within Pennsylvania.
Interstate 579 (I-579) is a north–south Interstate Highway entirely within Pittsburgh, Pennsylvania. The highway is 2.73 miles (4.39 km) long. I-579 is also known as the Crosstown Boulevard since it crosses the backside of Downtown Pittsburgh.
Interstate 76 (I-76) is an east–west Interstate Highway in the Eastern United States. The highway runs approximately 435.66 miles (701.13 km) from an interchange with I-71 west of Akron, Ohio, east to I-295 in Bellmawr, New Jersey. This route is not contiguous with I-76 in Colorado and Nebraska.
The Fort Pitt Bridge is a steel, double-decked bowstring arch bridge that spans the Monongahela River near its confluence with the Allegheny River in Pittsburgh, Pennsylvania. It carries Interstate 376 between the Fort Pitt Tunnel and Downtown Pittsburgh. Opened in June 1959 as a replacement for the Point Bridge, the Fort Pitt Bridge was the world's first computer-designed bowstring arch bridge and double-decked bowstring arch bridge. The bridge is known for its difficult lane changes, especially on the lower level, often requiring people to go from the extreme left lane across two lanes to the extreme right lane in only 700 feet. The upper level is more forgiving for some routes but still requires a full span lane change in 700 feet to get from the south side entrance to the downtown exits.
Pennsylvania Route 28 is a major state highway, which runs for 98 miles (158 km) from Anderson Street in Pittsburgh to U.S. Route 219 (US 219) in Brockway in Pennsylvania in the United States.
The Mon–Fayette Expressway is a partially-completed controlled-access toll road that is planned to eventually link Interstate 68 near Morgantown, West Virginia with Interstate 376 near Monroeville, Pennsylvania. The ultimate goal of the highway is to provide a high speed north–south connection between Morgantown and the eastern side of Pittsburgh while revitalizing economically distressed Monongahela River Valley towns in Fayette and Washington counties, serving as an alternative to Interstate 79 to the west, as well as relieving the PA 51 alignment from Pittsburgh to Uniontown.
The West End Bridge is a steel tied-arch bridge over the Ohio River in Pittsburgh, Pennsylvania, approximately 1 mile (1.6 km) below the confluence of the Allegheny and Monongahela Rivers. It connects the West End to the Chateau neighborhood on the North Side of Pittsburgh.
The Neville Island Bridge is a tied arch bridge which carries Interstate 79 and the Yellow Belt across the Ohio River and over Neville Island, west of Pittsburgh, Pennsylvania.
A large metropolitan area that is surrounded by rivers and hills, Pittsburgh has an infrastructure system that has been built out over the years to include roads, tunnels, bridges, railroads, inclines, bike paths, and stairways; however, the hills and rivers still form many barriers to transportation within the city.
Pennsylvania Route 65 is a major 51-mile-long (82 km) state highway located in western Pennsylvania, United States. The route, traveling north–south from the Interstate 279/U.S. Route 19 Truck concurrency in Pittsburgh north to the PA 108/PA 168 concurrency in New Castle, connects downtown Pittsburgh to the northwestern portion of the Pittsburgh Metropolitan Area. PA 65 is similar in its purpose to PA 18 and PA 51, both of which run parallel to PA 65 at one point or another; however, the three routes pass through different cities for most of their respective alignments.
Pennsylvania Route 885 is a 14.1-mile-long (22.69 km) north–south state highway in the U.S. state of Pennsylvania. It runs from Pennsylvania Route 837 in Clairton north to Interstate 579 in Pittsburgh. The route is entirely within Allegheny County and serves as a connector between the city of Pittsburgh and its southern suburbs.
Pennsylvania Route 837 is a state route located in western Pennsylvania. The southern terminus of the route is at Pennsylvania Route 88 in the Carroll Township hamlet of Wickerham Manor. The northern terminus is at U.S. Route 19 and PA 51 near downtown Pittsburgh at the junction of the Ohio, Allegheny and Monongahela rivers. The highway parallels the Monongahela River for all of its route with the exceptions of its extreme north and south ends. Popular amusement park Kennywood is located along this route.
U.S. Route 19 Truck is a truck route of US 19 located in Western Pennsylvania in Greater Pittsburgh that has a length of 19.4 miles (31.2 km). It is a loop off US 19; the southern terminus located in Mt. Lebanon and the northern terminus in McCandless, connecting to US 19 at both ends. The route is notable for a large, unorthodox interchange with the Penn–Lincoln Parkway just west of the Fort Pitt Tunnel, where the route joins the parkway and forms several wrong-way concurrencies, including one with its own opposing directions. North of Pittsburgh, US 19 Truck is called McKnight Road and south of Pittsburgh it carries West Liberty Avenue and Washington Road.
The Manchester Bridge, also known as the North Side Point Bridge, was a steel Pratt truss bridge that spanned the Allegheny River in Pittsburgh, Pennsylvania.
The Point Bridge was a steel cantilever truss bridge that spanned the Monongahela River in Pittsburgh, Pennsylvania.
I-279 / US 19 Truck 
