Pennsylvania Route 366
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| Route information | ||||
| Maintained by PennDOT | ||||
| Length: | 14.8 mi (23.8 km) | |||
| Existed: | 1928 – present | |||
| Major junctions | ||||
| West end: |
 PA 28 in Tarentum
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 PA 780 in Lower Burrell PA 380 in Murrysville
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| East end: |
 PA 66 in Murrysville |
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| Location | ||||
| Counties: | Allegheny, Westmoreland | |||
| Highway system | ||||
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Pennsylvania Route 366 (PA 366) is a 14.8-mile-long (23.8 km) state highway located in Allegheny and Westmoreland Counties in Pennsylvania. The western terminus is at PA 28 in Tarentum. The eastern terminus is at PA 66 in Murrysville. The last 1/2 mile of the Red Belt route of the Allegheny County belt system runs along PA 366 in Tarentum from its eastbound beginning at the PA 28 interchange to the intersection of Freeport Rd. and Ross St. where the Red Belt terminates.
PA 366 begins at an interchange with the PA 28 freeway in Fawn Township, Allegheny County, heading south on Bull Creek Road, a four-lane divided highway that is part of the Red Belt of the Allegheny County belt system. Within the interchange, the road crosses into Tarentum and passes through wooded areas. Farther south, the route becomes Ross Street and passes a mix of homes and businesses. At the Seventh Avenue intersection, the Red Belt ends and the median of the road widens as it comes to a bridge over Norfolk Southern's Conemaugh Line, reaching an eastbound exit and westbound entrance with First Avenue. After this, PA 366 heads onto the George D. Stuart Bridge over the Allegheny River. Upon crossing the river, the route enters New Kensington in Westmoreland County, becoming four-lane undivided Tarentum Bridge Road, passing between residential neighborhoods to the west and businesses to the east. The road continues south and gains a center left-turn lane, running through more commercial areas. PA 366 heads into woods and becomes a three-lane road with one eastbound lane and two westbound lanes, coming to an interchange with PA 56. At this point, PA 366 heads south concurrent with PA 56 on four-lane divided Stevenson Boulevard, curving southwest through more wooded areas before turning south and running to the east of Valley High School. The road comes to an intersection with the western terminus of PA 780 prior to passing a few businesses, with PA 56 splitting to the west. At this point, PA 366 becomes concurrent with PA 56 Truck and turns southwest, running near more homes and businesses as it becomes a two-lane undivided road with frontage roads. The frontage roads end and the route curves south past more commercial establishments. PA 366 merges southeast onto Freeport Street and turns south into Lower Burrell.
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