 In the 1950s, PA 73 was routed onto the one-way pair of Robbins Street eastbound and Levick Street westbound between US 13 (Frankford Avenue) and the Tacony–Palmyra Bridge; the US 422 concurrency was removed as well.Also, the route was realigned to use Washington Lane between Church Road and Township Line Road.Between Reading and Mount Penn, US 422/PA 73 was shifted to the one-way pair of Perkiomen Avenue eastbound and Mineral Spring Road westbound while PA 73 was designated concurrent with westbound US 422 Alt.