 US 222 was routed onto this bypass by 1976, with the Warren Street Bypass extended northeast to Pricetown Road in 1980.The part of the Warren Street Bypass northeast of US 222 along with Pricetown Road became State Route 2026 (SR 2026) when the Location Referencing System was established.In 1998, PA 12 was assigned to its current alignment following the rerouting of US 222 onto a new bypass of Reading.