SR 234 heads north from I-66 as a four-lane divided highway that reduces to two lanes at the entrance to the Manassas Campus of Northern Virginia Community College, and then enters Manassas National Battlefield Park, site of the First and Second Battles of Bull Run. The state highway intersects US 29 (Lee Highway) within the battlefield park. After leaving the preserve, SR 234 passes through the community of Sudley Springs, where the highway crosses Little Bull Run and curves to the west. The state highway heads through the community of Catharpin before reaching its northern terminus at US 15 (James Madison Highway) in the hamlet of Woolsey north of Haymarket.