Along this stretch, the route forms a concurrency with PA 82 in Unionville, where it intersects the western terminus of PA 162.
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Miner Street in West Chester, which comprises part of PA 842, was laid out in 1831 as part of an expansion of West Chester built by William Everhart.
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PA 842 curves northeast andf reaches an intersection with PA 82, where it turns east to form a concurrency with that route on Doe Run Road.
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The western terminus of the route is at the Pennsylvania Route 82 / Pennsylvania Route 842 concurrency in Unionville, Chester County.
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PA 162 begins at an intersection with PA 82/PA 842 in the community of Unionville in East Marlborough Township, heading north on two-lane undivided Embreeville Road.
In Unionville, PA 82 begins to turn towards the west and is called Doe Run Road and has a concurrency with Pennsylvania Route 842.