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18 21

PA 18(N-S)/PA 21(E-W) Duplex

PA 18 and PA 21 join for 6 miles from Rogersville to West Waynesburg in Greene County.

Pete Zapadka

A junction PA 21 shield stands along PA 18 northbound near the western split of the PA 18/PA 21 duplex. The bridge crosses the South Fork Ten Mile Creek. PA 18/PA 21 crosses the creek six times, not counting this PA 18 crossing.


Just ahead, PA 18 joins PA 21 here, in this recently reconstructed intersection. This duplex is the southwesternmost multiplex in PA, and this photo shows the southwesternmost split of the state and the southwesternmost intersection of PA state routes.



Terraserver Imagery

Adjacent Multiplexes

18 221
19 21



18 21
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