 PA 63 bypasses the community of Mainland to the northeast with two westbound lanes and one eastbound lane before entering Towamencin Township near a crossing of Skippack Creek and heading into the North Penn Valley region.In Towamencin Township, PA 63 widens to four lanes and is called Sumneytown Pike again, passing woods and development before reaching an interchange with I-476 (Pennsylvania Turnpike Northeast Extension).The I-476 junction includes a full interchange via a ramp passing through the toll plaza along with additional E-ZPass-only ramps to southbound I-476 and from northbound I-476.