 Pennsylvania Route 12 ( PA 12 ) is a 9 @.@ 566 @-@ mile @-@ long ( 15 @.@ 395 km ) state highway located in Berks County in eastern Pennsylvania . The western terminus of the route is at U.S. Route 222 ( US 222 ) and US 422 in Wyomissing . Its eastern terminus is PA 662 in Ruscombmanor Township . In the Reading area , PA 12 is a four @-@ lane freeway called the Warren Street Bypass that heads northeast through urban areas , coming to interchanges with several roads including PA 183 , PA 61 , and US 222 Bus . In Alsace Township , the route becomes a two @-@ lane undivided surface road called Pricetown Road and continues northeast through rural areas , intersecting PA 73 before ending at PA 662 . 
