Pennsylvania Route 121
Encyclopedia
Pennsylvania Route 121 is an 4 mile long state highway
located in Allegheny
county in Pennsylvania
. The southern terminus is at US 19
in Mt. Lebanon
. The northern terminus is at PA 50
in Green Tree
in Mt. Lebanon
, heading northwest on Cochran Road, a two-lane undivided road that heads through residential areas. From the southern terminus, the route is concurrent
with the Yellow Belt of the Pittsburgh/Allegheny County Belt System
. The road widens to four lanes as it enters commercial areas and becomes the border between Mt. Lebanon to the southwest and Scott Township
to the northeast. PA 121 splits from the Yellow Belt and Cochran Road by turning north onto four-lane Greentree Road, fully entering Scott Township. The road passes through residential and commercial areas as it turns to the northeast, narrowing to two lanes as it enters Green Tree
. In this area, the route passes more homes, with the Blue Belt joining the road at the Potomac Avenue intersection. PA 121 curves to the north, becoming a three lane road with a reversible lane
. The road enters commercial areas, widening to four lanes as it reaches an interchange with I-376
/US 22
/US 30
. Immediately after this interchange, PA 121 turns west onto Mansfield Avenue, a three lane road with one northbound lane and two southbound lanes. The route turns north onto two-lane Poplar Street and heads into wooded areas of homes. PA 121 heads northwest to reach its northern terminus at PA 50
on the border of Green Tree and Pittsburgh in commercial areas.
State highway
State highway, state road or state route can refer to one of three related concepts, two of them related to a state or provincial government in a country that is divided into states or provinces :#A...
located in Allegheny
Allegheny County, Pennsylvania
Allegheny County is a county in the southwestern part of the U.S. state of Pennsylvania. As of the 2010 census, the population was 1,223,348; making it the second most populous county in Pennsylvania, following Philadelphia County. The county seat is Pittsburgh...
county in Pennsylvania
Pennsylvania
The Commonwealth of Pennsylvania is a U.S. state that is located in the Northeastern and Mid-Atlantic regions of the United States. The state borders Delaware and Maryland to the south, West Virginia to the southwest, Ohio to the west, New York and Ontario, Canada, to the north, and New Jersey to...
. The southern terminus is at US 19
U.S. Route 19
U.S. Route 19 is a north–south U.S. Highway. Despite encroaching Interstate Highways, the route has remained a long-haul route, connecting the Gulf of Mexico with Lake Erie....
in Mt. Lebanon
Mt. Lebanon, Pennsylvania
Mt. Lebanon is a home rule municipality, formerly a township, in Allegheny County, Pennsylvania, United States. The population was 33,137 at the 2010 census....
. The northern terminus is at PA 50
Pennsylvania Route 50
Pennsylvania Route 50 is a long state highway located in western Pennsylvania. The western terminus of the route is at Pennsylvania Route 844 in the Independence Township community of Independence less than a mile from the West Virginia state line. The eastern terminus is at Pennsylvania Route 60...
in Green Tree
Green Tree, Pennsylvania
Green Tree is a borough in Allegheny County, Pennsylvania, United States, and a suburb of Pittsburgh. The population was 4,432 at the 2010 census.The town is the birthplace of U.S...
Route description
PA 121 begins at an intersection with US 19U.S. Route 19 in Pennsylvania
U.S. Route 19 in Pennsylvania closely parallels Interstate 79 for its entire length. US 19 enters Pennsylvania in Greene County near Mount Morris. Its northern terminus is in the city of Erie. Part is named for Commodore Oliver Hazard Perry, hero of the Battle of Lake Erie.-Route description:In...
in Mt. Lebanon
Mt. Lebanon, Pennsylvania
Mt. Lebanon is a home rule municipality, formerly a township, in Allegheny County, Pennsylvania, United States. The population was 33,137 at the 2010 census....
, heading northwest on Cochran Road, a two-lane undivided road that heads through residential areas. From the southern terminus, the route is concurrent
Concurrency (road)
A concurrency, overlap, or coincidence in a road network is an instance of one physical road bearing two or more different highway, motorway, or other route numbers...
with the Yellow Belt of the Pittsburgh/Allegheny County Belt System
Pittsburgh/Allegheny County Belt System
The Allegheny County Belt System color codes miscellaneous county roads to form a unique system of routes in Allegheny County, Pennsylvania and around the city of Pittsburgh....
. The road widens to four lanes as it enters commercial areas and becomes the border between Mt. Lebanon to the southwest and Scott Township
Scott Township, Allegheny County, Pennsylvania
Scott Township is a township in Allegheny County, Pennsylvania, United States. The population was 17,024 at the 2010 census.-Geography:Scott Township is located at ....
to the northeast. PA 121 splits from the Yellow Belt and Cochran Road by turning north onto four-lane Greentree Road, fully entering Scott Township. The road passes through residential and commercial areas as it turns to the northeast, narrowing to two lanes as it enters Green Tree
Green Tree, Pennsylvania
Green Tree is a borough in Allegheny County, Pennsylvania, United States, and a suburb of Pittsburgh. The population was 4,432 at the 2010 census.The town is the birthplace of U.S...
. In this area, the route passes more homes, with the Blue Belt joining the road at the Potomac Avenue intersection. PA 121 curves to the north, becoming a three lane road with a reversible lane
Reversible lane
A reversible lane , called a counterflow lane or contraflow lane in transport engineering nomenclature, is a lane in which traffic may travel in either direction, depending on certain conditions...
. The road enters commercial areas, widening to four lanes as it reaches an interchange with I-376
Interstate 376
Interstate 376 is a major auxiliary route of the Interstate Highway System in the U.S. state of Pennsylvania, located entirely 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 Turnpike...
/US 22
U.S. Route 22 in Pennsylvania
U.S. Route 22 is an east–west route stretching from Cincinnati, Ohio in the west to Newark, New Jersey in the east. In Pennsylvania, the route runs for between the West Virginia state line at Washington County, where it is a limited-access expressway-grade route through the western suburbs...
/US 30
U.S. Route 30 in Pennsylvania
In the U.S. state of Pennsylvania, U.S. Route 30 runs east–west across the southern part of the state, passing through Pittsburgh and Philadelphia on its way from the West Virginia state line east to the Benjamin Franklin Bridge over the Delaware River into New Jersey...
. Immediately after this interchange, PA 121 turns west onto Mansfield Avenue, a three lane road with one northbound lane and two southbound lanes. The route turns north onto two-lane Poplar Street and heads into wooded areas of homes. PA 121 heads northwest to reach its northern terminus at PA 50
Pennsylvania Route 50
Pennsylvania Route 50 is a long state highway located in western Pennsylvania. The western terminus of the route is at Pennsylvania Route 844 in the Independence Township community of Independence less than a mile from the West Virginia state line. The eastern terminus is at Pennsylvania Route 60...
on the border of Green Tree and Pittsburgh in commercial areas.