 The U.S. highways continue east as Main Street, which passes under the Norfolk Southern rail line before US 19 turns north onto Porterfield Highway.US 19 heads northwest as a four-lane divided highway that is joined by US 58 Alternate (Russell Road) before leaving the town of Abingdon.The two highways cross Walker Mountain and briefly follow the North Fork Holston River before following Moccasin Creek through Moccasin Gap between Clinch Mountain to the west and Brumley Mountain to the east.