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Pennsylvania Route 378 (PA 378) is a north-to-south road in Lehigh and Northampton counties. The southern terminus is at PA 309 in Center Valley. Its northern terminus is at U.S. Route 22 (US 22) in Bethlehem. The route heads north from PA 309 as a two-lane undivided road through Upper Saucon Township and Lower Saucon Township before crossing South Mountain into the city of Bethlehem. Here, PA 378 follows city streets through Bethlehem's South Side, intersecting the northern terminus of PA 412. The route crosses the Lehigh River and becomes a four-lane freeway that continues north to US 22. PA 378 is the only highway from US 22 to Center City Bethlehem, and a quick route for visitors traveling to the Sands Casino Resort on the city's South Side. The portion of PA 378 south of Bethlehem was originally numbered as PA 12 in 1928 and renumbered to PA 191 in 1961. Construction on the freeway from West Broad Street to US 22 began in 1966 and finished two years later. This freeway was numbered Interstate 378 (I-378) and served as a spur of I-78, which formerly ran along the US 22 freeway. When I-78 was rerouted from US 22 to south of the city, the spur became disjointed from its parent. I-378 was downgraded to state route status in 1971. Three years later, the PA 378 designation replaced PA 191 from Center Valley to Third Street in Bethlehem. The state did not remove the exit tabs for the freeway section, making PA 378 one of only a few state freeways with exit numbers (another one is PA 309 in Wilkes-Barre). The exit numbers also go in the wrong direction: Exit 3 is south of Exit 1, most likely due to the freeway being built when Pennsylvania still practiced sequential exit numbering. In 2009, the portion north of the Lehigh River was named the Fred B. Rooney Highway. ==Route description== PA 378 begins at two separate intersections with PA 309 in the community of Center Valley in Upper Saucon Township, Lehigh County. The route heads northward as a three-lane road with a center left-turn lane, passing through Center Valley and paralleling Old Bethlehem Pike. The road runs through a mix of farm fields and woods with residential and commercial development. After an intersection with Preston Lane, PA 378 turns to the northeast. Farther north, the highway passes to the west of Saucon Valley Country Club. At the intersection with Osgood Avenue, PA 378 turns to the northeast, crossing the Old Bethlehem Pike soon after. After crossing Saucon Valley Road, the highway comes to an intersection with Center Valley Parkway, an arterial boulevard. After that, the highway enters Lower Saucon Township in Northampton County and crosses under I-78 without an interchange. Past this, PA 378 heads north through the community of Seidersville, where it passes homes and businesses as a four-lane road parallel to Old Philadelphia Pike. The road traverses South Mountain where it runs through forested areas with some homes. Descending the mountain, PA 378 bends northwestward as a four lane arterial known as Wyandotte Street until leaving the University Heights area near Holy Ghost Cemetery. PA 378 continues into the city of Bethlehem, where it turns northward into residential areas as a two-lane road and is called Wyandotte Street. In the South Side section of the city, PA 378 intersects with the northern terminus of PA 412 (Broadway). The route continues northward and intersects a ramp to 3rd Street that provides access to PA 412, at which point it widens to four lanes. PA 378 passes over Norfolk Southern's Lehigh Line before crossing the Lehigh River on the Hill to Hill Bridge.〔 PA 378 heads northward across the Hill to Hill Bridge, at which point it crosses back into Lehigh County. The route crosses over West Lehigh Street and intersects with the off-ramp to Main Street in Bethlehem. There was formerly a ramp to 2nd Avenue, but that has been closed and is only used by pedestrians. After this interchange, PA 378 becomes a four-lane freeway and is named the Fred B. Rooney Highway. The highway continues northward through the city, crossing under West Broad Street and reaching a southbound interchange with North Street, which leads to Center City and Third Avenue. The freeway continues northward, crossing over and receiving an on-ramp from Union Boulevard.〔〔 The road turns to the northwest and interchanges with Eighth Avenue at exit 2E and exit 2W northbound and exit 2 southbound. PA 378 turns westward through Bethlehem, paralleling Union Boulevard and crossing under Fourteenth Avenue. The route then turns northward, crossing under Eaton Avenue and a Norfolk Southern rail line and passing the Hal Fenicle Memorial Park. PA 378 continues northbound, interchanging with and crossing under Catasauqua Road. After running to the southwest of Lehigh Valley Hospital at Muhlenberg, the freeway enters an interchange with US 22 (Lehigh Valley Thruway), PA 378 northbound traffic is directed onto US 22 westbound.〔〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pennsylvania Route 378」の詳細全文を読む スポンサード リンク
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