What is the benefit to connecting US 1 directly to PA 413 (Pine Street) via an interchange?

PA 413 (Pine Street) is federally classified as a Regional Principal Arterial.  This classification of roadway is meant to carry most trips entering and leaving the area and serves intra area travel.  In the existing condition, U.S. 1 traffic must exit the mainline via frontage roads and then disperse onto neighborhood streets and then travelers work their way to a major street (e.g. Pine Street) to continue or complete their trips.  Providing a direct connection to PA 413 (Pine Street) via an interchange reduces traffic on neighborhood streets and places vehicles directly onto PA 413 (Pine Street) via a modern interchange design.